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Post screenshots of both your accounts so we can visualize what you are seeing.

Judging from your first screenshot, it looks like dkmarsh may be correct.

Can we see a shot of the bottom of that first page, please?

The dot is what we're looking for, but dragging it up as far as it will go should bring up the contents.

The fact that things work as expected in your test account suggests that com.apple.mail.plist may be corrupted, but I've got no idea if trashing it would be at all useful.

https://imgur.com/BzGASLV This is a pic of my normal everyday email which isn't working. You can see that the headers show up but no content.

https://imgur.com/igO4I6V This one show my testing email which shows the header and the content properly. Same computer but email not working in everyday login.

:dope slap: The content of the View menu changes according to the options that are currently selected. Deselect show column layout and Show bottom Preview should appear in place of Show Side Preview.

The dot is what we're looking for, but dragging it up as far as it will go should bring up the contents.

The fact that things work as expected in your test account suggests that com.apple.mail.plist may be corrupted, but I've got no idea if trashing it would be at all useful.

It's actually in the Containers folder of your user library: ~/Library/Containers/com.apple.mail/Data/Library/Preferences/com.apple.mail.plist
However, if your going to reset the Mail defaults, you would be better to delete the com.apple.mail folder, and not individual files within.
If you have one in the ~/Library/Preferences/ folder, delete it. It won't be replaced.

Container folder path is:
~/Library/Containers/com.apple.mail

Quit Mail, move that folder to the trash your desktop, then open Mail. You will need to reset your defaults. If something goes wrong, you can always put that folder back and replace the new one that was created. (Emphasis added)

I followed your above link, and it looks to me as if Glenn Leblanc is correct, because I just looked at ~/Library/Prefs/com.apple.mail.plist on my MBP (also running 10.15.7), and it was last modified in April 2018, which pretty much confirms that it's been supplanted. (I confirmed that by deleting mine and restarting without the file being recreated.)

I suggest that you follow these instructions: The only thing I'd add is that the suggestion that you restart your MBP immediately after moving that folder to your desktop...before reopening Mail.

I'm confused about which path to follow. When you have time could you give me a step by step instruction list?
There are several paths mentioned and I might do the wrong one.

In Finder, hit command-shift-G, and enter "~/Library/Containers/com.apple.mail" (no quotes) in the field.

The folder that comes up in blue is the one you want to move to your desktop.

OMG! It worked! Thank you! But, always something, right? The headers are in small letters. I tried changing the fonts but that didn't help. Also, all my saved folders disappeared on the side like for my receipts, etc. They are still on the Yahoo website but not reflected anymore in Apple Mail. Merry Christmas to me! Oh, and do I trash the blue folder I put on my desk top or put it back? Thanks for being so helpful, always.

Update: I was finally able to change the header font size. But, my sorting folders are till missing.

Nevermind, I finally found those, too. Yippee!

Great!

You can trash the folder on your desktop as long as you're certain that everything is running as expected.

:dope slap: The content of the View menu changes according to the options that are currently selected. Deselect show column layout and Show bottom Preview should appear in place of Show Side Preview.

By the way, it's a good thing you posted the link to that Apple discussion, because I had totally forgotten about the new container structure.