20H2 Doesn't Show Fonts I Installed

Hi...

Just got a Dell Optiplex 7010 with Win 10 Pro 20H2, build 19042.928. Windows Font Manager seems to work fine and I installed several Helvetica and Korinna fonts, all of which showed up fine right after installation. A few minutes later, none of them were available in OO or Libre.

So I figured the install didn't go right. Installed them again but got pop-ups saying those fonts were already installed, yet they don't appear in either the icon or details listings and are not available in word processing or spreadsheet software.

Next, I shut down completely. Half an hour later, rebooted. Still no Helveticas or Korinnas. Tried reinstalling. Same pop-ups saying they are installed. Can't be seen.

Reinstalled them again, clicking on replace the previous installation for each. Same results.

I'm stymied. I'd greatly appreciate any ideas on what I should try next.

Thank you, JB, but that doesn't apply since I'm past the 10 day period. I'm still stymied.

Are they purchased fonts? If so, may be a copyright issue, as in it isn't applying permission when installed. I installed a number of free fonts on my new system just the other day and have had no issues with them.

JB...I wish it were so simple an excuse for MS, but it isn't. All are legally purchased from Corel, Adobe, Word Perfect, etc. And all worked on previous iterations of MS Win 10.

All of these fonts also currently work on my other Win 10 computers.

If you'll refer to pgh 2 in my orig posting above, you'll see that I already did that and MS said these fonts were -- indeed! -- installed.

Thank you for trying to help...but the Libre Office poster finally used Window Type Manager which worked for him/her but, as I stated above, not for me.

Check out this.
Some system fonts not loading - Ask LibreOffice

If that's not working again.. I will do a quick research.