How to change default application for all files opened with another application? XFCE

I have Manjaro XFCE.

In my default applications, a ton of file extensions are set to open with Atom as default. But I would like ALL of them to open with Mousepad

How can I change all of them? (without going one by one ofc as there is a ton of them). Is there maybe settings file for that at least so I can edit it?

That would be ~/.config/mimeapps.list.
https://wiki.archlinux.org/title/XDG_MIME_Applications#mimeapps.list

try get thefile
grep atom ~/.config/mimeapps.list
find as a whole file name, put in e.g. n

sed -i.bak -E "s/\b$n\b/Mousepad/" ~/.config/mimeapps.list

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