I have the same problem with MaryD-6001 in this Microsoft Q&A thread:
"This does not change the font size for the menu bar or the Bookmark bar and that font is about a size 8 which is ridiculous. Everyone says to do this through the Accessibility settings but it doesn't work so why don't you come up with a real solution. Windows 11 is worse than 10 for making the menu bar font smaller on the browsers and on other programs purchased and installed on the Windows 11 system. I can't believe we can't adjust that. If all the comments were read many people have tried this without any success. Windows 11 is great for the near-sighted computer tech people but not for a far-sighted person corrected to 20-20 vision!!!!!!!I am totally sorry I upgraded to this platform!"
What shall I do?