We had some plugin installed that preloads fonts.
We do no use the plug in anymore but in the console we have errors like this:

GET ../wp-content/themes/fonts/libre-franklin-v7-latin-800.woff2
net::ERR_ABORTED 404

This is probably caused by the preload plugin.
We do not remember the name of the plugin since we have tried out several.

Question is: how can we manually remove traces of this plugin (and others)?