Hello.
I had to switch to nvidia driver as nouveau crash during windows session on a virtualbox vm ( linux hosts ).
After rebooting font have change ( name and size ) on every things.

I managed to change some size (on the desktop for example) using ksystemsettings5. But I need to change a lot of other things and have not found where to apply changes.


Dolphin:
I want to change the size of the characters in the left side panel "PLaces" and "Folders".


Kate, Kwrite:
I want to change the size of the characters in the left side panel "Documents folder".

Firefox:
I want to change the size of the characters in the left side panel "Bookmarks".
I want to change the size of the characters in top "Menu bar".

Any help is welcome.