My WordPress theme displays correctly if I view the website in a browser. However, when I go into the “full site editor” the text size is smaller, for some reason.

What I have tried so far:

• I have made sure that functions.php loads the block styles using:
  add_theme_support( 'wp-block-styles' );
• I have deleted the cache in the web browser.
• I have tried a different browser.
• I do not have any styles in stylesheet.css

Here is an example:

This is the theme.json file:

{
    "$schema": "https://schemas.wp.org/wp/6.1/theme.json",
    "settings": {
        "color": {
            "palette": [
                {
                    "color": "#292929",
                    "name": "Body text black",
                    "slug": "body-text-black"
                }
            ]
        },
        "appearanceTools": true,
        "layout": {
            "contentSize": "750px",
            "wideSize": "1000px"
        },
        "spacing": {
            "units": [
                "%",
                "px",
                "em",
                "rem",
                "vh",
                "vw"
            ]
        },
        "typography": {
            "fluid": true,
            "fontFamilies": [
                {
                    "fontFace": [
                        {
                            "fontFamily": "Source Serif Pro",
                            "fontStyle": "normal",
                            "fontWeight": "200",
                            "src": [
                                "file:./assets/fonts/source-serif-pro_normal_200.woff2"
                            ]
                        },
                        {
                            "fontFamily": "Source Serif Pro",
                            "fontStyle": "italic",
                            "fontWeight": "200",
                            "src": [
                                "file:./assets/fonts/source-serif-pro_italic_200.woff2"
                            ]
                        },
                        {
                            "fontFamily": "Source Serif Pro",
                            "fontStyle": "normal",
                            "fontWeight": "300",
                            "src": [
                                "file:./assets/fonts/source-serif-pro_normal_300.woff2"
                            ]
                        },
                        {
                            "fontFamily": "Source Serif Pro",
                            "fontStyle": "italic",
                            "fontWeight": "300",
                            "src": [
                                "file:./assets/fonts/source-serif-pro_italic_300.woff2"
                            ]
                        },
                        {
                            "fontFamily": "Source Serif Pro",
                            "fontStyle": "normal",
                            "fontWeight": "600",
                            "src": [
                                "file:./assets/fonts/source-serif-pro_normal_600.woff2"
                            ]
                        },
                        {
                            "fontFamily": "Source Serif Pro",
                            "fontStyle": "italic",
                            "fontWeight": "600",
                            "src": [
                                "file:./assets/fonts/source-serif-pro_italic_600.woff2"
                            ]
                        },
                        {
                            "fontFamily": "Source Serif Pro",
                            "fontStyle": "normal",
                            "fontWeight": "700",
                            "src": [
                                "file:./assets/fonts/source-serif-pro_normal_700.woff2"
                            ]
                        },
                        {
                            "fontFamily": "Source Serif Pro",
                            "fontStyle": "italic",
                            "fontWeight": "700",
                            "src": [
                                "file:./assets/fonts/source-serif-pro_italic_700.woff2"
                            ]
                        },
                        {
                            "fontFamily": "Source Serif Pro",
                            "fontStyle": "italic",
                            "fontWeight": "900",
                            "src": [
                                "file:./assets/fonts/source-serif-pro_italic_900.woff2"
                            ]
                        },
                        {
                            "fontFamily": "Source Serif Pro",
                            "fontStyle": "normal",
                            "fontWeight": "900",
                            "src": [
                                "file:./assets/fonts/source-serif-pro_normal_900.woff2"
                            ]
                        },
                        {
                            "fontFamily": "Source Serif Pro",
                            "fontStyle": "italic",
                            "fontWeight": "400",
                            "src": [
                                "file:./assets/fonts/source-serif-pro_italic_400.woff2"
                            ]
                        },
                        {
                            "fontFamily": "Source Serif Pro",
                            "fontStyle": "normal",
                            "fontWeight": "400",
                            "src": [
                                "file:./assets/fonts/source-serif-pro_normal_400.woff2"
                            ]
                        }
                    ],
                    "fontFamily": "Source Serif Pro",
                    "slug": "source-serif-pro"
                },
                {
                    "fontFace": [
                        {
                            "fontFamily": "Inter",
                            "fontStyle": "normal",
                            "fontWeight": "100 900",
                            "src": [
                                "file:./assets/fonts/inter_normal_100 900.ttf"
                            ]
                        }
                    ],
                    "fontFamily": "Inter",
                    "slug": "inter"
                }
            ],
            "fontSizes": [
                {
                    "fluid": {
                        "max": "15.8px",
                        "min": "14.0px"
                    },
                    "name": "Tiny",
                    "size": "15.8px",
                    "slug": "tiny"
                },
                {
                    "fluid": {
                        "max": "17.7px",
                        "min": "15.8px"
                    },
                    "name": "Small",
                    "size": "17.7px",
                    "slug": "small"
                },
                {
                    "fluid": {
                        "max": "22.5px",
                        "min": "20.0px"
                    },
                    "name": "Normal",
                    "size": "22.5px",
                    "slug": "normal"
                },
                {
                    "fluid": {
                        "max": "20.0px",
                        "min": "17.7px"
                    },
                    "name": "Heading 6",
                    "size": "20.0px",
                    "slug": "heading"
                },
                {
                    "fluid": {
                        "max": "22.5px",
                        "min": "20.0px"
                    },
                    "name": "Heading 5",
                    "size": "22.5px",
                    "slug": "heading-5"
                },
                {
                    "fluid": {
                        "max": "25.3px",
                        "min": "22.5px"
                    },
                    "name": "Heading 4",
                    "size": "25.3px",
                    "slug": "heading-4"
                },
                {
                    "fluid": {
                        "max": "28.4px",
                        "min": "25.3px"
                    },
                    "name": "Heading 3",
                    "size": "28.4px",
                    "slug": "heading-3"
                },
                {
                    "fluid": {
                        "max": "32.0px",
                        "min": "28.4px"
                    },
                    "name": "Heading 2",
                    "size": "32.0px",
                    "slug": "heading-2"
                },
                {
                    "fluid": {
                        "max": "36.0px",
                        "min": "32.0px"
                    },
                    "name": "Heading 1",
                    "size": "36.0px",
                    "slug": "heading-1"
                }
            ]
        }
    },
    "styles": {
        "elements": {
            "heading": {
                "typography": {
                    "fontFamily": "Inter"
                }
            }
        },
        "typography": {
            "fontFamily": "var:preset|font-family|source-serif-pro",
            "fontSize": "var:preset|font-size|normal",
            "lineHeight": "1.5"
        }
    },
    "templateParts": [
        {
            "area": "header",
            "name": "header"
        },
        {
            "area": "footer",
            "name": "footer"
        }
    ],
    "version": 2
}