Of course, there is the “restore to default” option, which affects a large number of settings (including some debugging settings).
If you have not tried it, use the "Reset all settings" parameter in the "Import and Export ..." wizard, which can be accessed from the "Tools" menu. He suggests saving the current settings before he reset.
If this solves your problem and you are still interested to know what you changed, you can save your settings again using the same wizard and make the difference between the two files.
Damien_The_Unbeliever
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