If you have a specific issue, please describe it and maybe someone here can assist. What you posted is too vague to address. Thank you.

≡ > Font size is the starting point for user interface font size issues.  

''<p>Tanya T. [[#question-1446301|said]]</p>'' <blockquote> I think you all should create a TEXT BOOK [phone book size] on how to use. </blockquote> We tried that about 10 years ago. https://archive.flossmanuals.net/thunderbird/ No one read it, they just continued posted questions that contained generally insufficient information like they did before it was written. It had zero impact on support. So with the limited resources available it was allowed to slide quietly into oblivion. Now we have support articles on specific topics that can be searched here https://support.mozilla.org/en-US/questions/thunderbird#search But a note of caution. Change the default under the search box to help articles otherwise they often get lost in the questions folk have asked. There is no table of contents for the articles unfortunately, but that is how the Mozilla support web site is structured. You might also want to use the filter by product on the right to limit results to Thunderbird. But these topics might help. https://support.mozilla.org/en-US/kb/global-search https://support.mozilla.org/en-US/kb/keyboard-shortcuts-searching https://support.mozilla.org/en-US/kb/using-saved-searches https://support.mozilla.org/en-US/kb/how-use-attachments The what is new document for Thunderbird 115 covers many of the changes in that version. https://support.mozilla.org/en-US/kb/new-thunderbird-115-supernova you will note a brief mention of changes to application menu “Touch” has been removed from ≡ > Density. It’s now Compact, Default and Relaxed, before 115, it was Compact, Normal and Touch. ≡ > Density This is generally the first point to modify the user interface density. ≡ > Font size is the starting point for user interface font size issues. Email font size display issues as another thing. You do not differentiate. So I guess.