Diễn đàn hỗ trợ Thunderbird

My thunderbird just upgraded to 115.2.2 (32-bit) - my windows is 64-bit - but I can't read the preview window or emails. Everything is in a gigantic font so I see only 2 lines at a time in both the main email edit screen and the preview screen. I tried changing it to Calibri 12 in Settings (it was Calibri 17) but that makes no difference. I also don't like that I have to go through File menu now to get messages for just one account. Is there a way to downgrade back to my old version? I guess that would be 115.2.1. Thank you!

Non-english letters like č and ć are displayed as ? in Correspondents in the Thunderbird mail list and in From in the individual mails. Not known to the font Thunderbird uses? Can I change that font?