Just to clarify, is this a general statement about the font sizes in the various areas of the Photo Mechanic interface or has something changed with MacOS Tahoe? If the screenshot you shared is meant to show a difference between the Navigator and Organizer, we're not really able to discern a difference.
I noted in my post that I was not able to upload an image at "normal" size, therefore it is difficult to see the difference in font sizes. There is a difference, albeit a slight one, but significant enough to make the difference between the product being usable and difficult to use.
Also, as noted in a prior post, this is not a Tahoe issue. It is a CB/Apple issue. I stated that I had not upgraded from my version of PM because the newer version affected the size of the font, again, slightly smaller, but significant in terms of usability. My reply was to be helpful when questioned about my statement. Obviously, my image upload was anything but.
Regardless, it's not an issue worth pursing. All I'm saying is that it would be nice if we had some control over font size -- changing it in MacOS does absolutely nothing unless it's related to the top bar menu.