Yes I agree that the Form Datasheet ribbon is a more logical place for the text formatting group items and have just done the same as you.
Your post has prompted me to get on & finish an article about the Aptos font which I began a few months ago
It should be ready in a day or so under the heading: What's Up with Aptos
When Aptos was released it became the default Office theme. New databases automatically had Aptos assigned but existing databases should not have been affected whether you used Calibri, Tahoma or whatever
That meant that the Detail & Header fonts changed to Aptos in all new databases
To change that, go to Options | Client Settings | Default Theme .... tick the checkbox and browse to / select e.g. the Office 2013 - 2022 Theme which has Calibri as the default font
Now when you create a new database, Calibri will once again be the default.
Interestingly, Aptos will no longer even appear in the list of available fonts - I'll explain why in the article and also how you can get it back in the font list again if you do want it available (without being the default)
NOTE:
1. You can also use Themes in the Form Design ribbon to change the theme including the default.
2. The expert on Themes is Peter Cole -
https://www.thememydatabase.co.uk
As for changing the update channel, the easiest approach is probably to add the Update Channel to the backstage view (File | Account) if you don't already have it.
By default, its in the consumer editions - Personal / Family but missing in all Business editions (to prevent unwanted meddling by users).
To add this to your own version of 365, I recommend the instructions in Peter Doering's excellent article
https://www.accessforever.org/post/demystifying-microsoft-365-update-channels
Peter provides a registry script which will add the button and allow you to switch channels easily. I do so frequently to test bugs / check the latest features etc
Hope that helps
BTW I'm currently using 365 version 2510 build 19322.20006 Beta Channel 64-bit (as shown above)
Since yesterday morning, I no longer see either truncated descenders or misplaced cursor selections. Perhaps it has been fixed in that version/build?