Can't change list and menu fonts in Thunderbird v 115.5.0

[modemjunkie]

There is a long thread about problems with changing font sizes in recent earlier versions of Thunderbird but until yesterday, I never had the problem.     I periodically have to enlarge the scale of fonts etc., in Windows 11 in order to read file lists in Windows Explorer. When I do that, the menu and list fonts in Thunderbird appear very large.  So, I go to View > Font Size and reduce the font size or simply reset it.  After I finish my other task, I simply reduce the font size again.      

But last night the function stopped working.  I tried just about every fix recommended here or elsewhere.  No luck.  I updated to v 115.50.  No change.   

Any new thoughts? My 80 year old eyes can barely see what's on the screen.  I have been using Thunderbird forever, it seems.  

Thanks. 

[Agentvirtuel]

Hello

Of course, this is not the answer you're looking for.
Nevertheless, if you wish to try https://connect.mozilla.org/t5/discussions/layout-css-devpixelsperpx/td-p/42594

Go to Configuration Editor https://support.mozilla.org/en-US/kb/config-editor

Alternatively in the Settings tab, enter about:config in the search box
The result is, Configuration Editor...

Click on Configuration Editor...
The Advanced Preferences tab will open.

Search for a preference name layout.css.devPixelsPerPx

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