Hello Ineptone,

Please see :

https://www.thewindowsclub.com/make-text-bigger-on-windows-10

And :

https://support.microsoft.com/en-ae/help/4028566/windows-10-change-the-size-of-text

Could this be what you are looking for  ?

This add-on is one way to enlarge the pane and menu fonts in TB:

https://addons.thunderbird.net/en-us/thunderbird/addon/theme-font-size-changer-fixed/

https://support.mozilla.org/en-US/kb/installing-addon-thunderbird

sfhowes said

This add-on is one way to enlarge the pane and menu fonts in TB: https://addons.thunderbird.net/en-us/thunderbird/addon/theme-font-size-changer-fixed/ https://support.mozilla.org/en-US/kb/installing-addon-thunderbird

@ sfhowes :

As the OP says : "can't find how to enlarge system (not message) font? " I didn't go look for any such add-on, but that just might be what they need .....

By 'system', I'm pretty sure the user only wants to change the display of the menus, folder names and message headers in TB, without making system-wide changes that affect all other apps.

sfhowes said

By 'system', I'm pretty sure the user only wants to change the display of the menus, folder names and message headers in TB, without making system-wide changes that affect all other apps.

Hence I said that the add-on you suggest might just be what they need .....