Second instance of fonts folder showing up in AppData\Local folder

While using NexusFont, I noticed that most of my fonts are showing up twice. I have since figured out how to get NexusFont to show my only the fonts I want, but researching the cause of that issue showed me the following related to font locations in my computer (new laptop; Windows 11):

1. 1. In addition to the regular C:\Windows\Fonts folder, fonts are being stored in this folder: C:\Users\MYUSERNAMEHERE\AppData\Local\Microsoft\Windows\Fonts
2. I am not intentionally saving them there. When I download a font and select "install for all users," it appears to save only in the main fonts folder, C:\Windows\Fonts, but if I slide a font into the Fonts folder to install it that way, it also copies to the AppData\Local folder.
3. If I install by sliding the font into the C:\Windows\Fonts folder, deleting it from there does remove it from both folders at the same time. If I try to delete it from the AppData\Local folder instead, I get an error message saying that I can't delete it because it is open in the System. Even if I close the C:\Windows\Fonts folder, which is the only thing open at that point that could be using the font, I still get that message, so the only way to delete it from that folder seems to be to delete it in the C:\Windows\Fonts folder. I haven't restarted and tried deleting from that folder without having opened the C:\Windows\Fonts folder first; if I do and anything changes, I'll update this info. (I know it shouldn't matter if it was open and then was closed, but I have known File Explorer to "think" a file is open when it has been closed until I restart my computer. Makes no sense, but it has happened a number of times.)
4. According to folder properties, the C:\Windows\Fonts folder size is 801 MB (I have a lot of fonts), but the AppData\Local fonts folder shows as 1.32 GB. Right now, space is not an issue, but that size difference is concerning - especially since it seems that a single font is taking up space in two different locations.
5. Any font that is in both folders shows up twice in NexusFont. I can click the info button for each to see from which folder it pulled the font.

Here are my questions

1. How is this AppData\Local folder generated?
2. Is this some sort of temporary folder? If so, then I am guessing I need to leave it alone.
   • If it's not temporary, then is there any way to clear it out other than deleting all of the fonts and reinstalling "for all users" since that doesn't seem to populate the second fonts folder? (Though that is probably not gonna happen because that would be a lot of work.)
   • If it's not temporary and I did find some way to clear it out, would that cause a problem? (If there's no clear answer, then I will likely leave it alone as I don't want to create problems.)
   • Is there any reason to try to empty that folder (other than the space issue)?

Notes:

• At this point, I am just really curious about the purpose of that second folder. I can live with it (unless space becomes an issue at some point).
• If you don't use NexusFont and are wondering why I don't use some other app to look at fonts, it's because I like the tagging features in NexusFont (Sans, Serif, Script, Monogram, Doodles, PersonalUseOnly, etc.). If you know of a different app I should consider that I can use to sort my fonts into categories, I'd love to hear about it. I am just getting started with NexusFont, so I am not so far along that I feel too invested to change. I tried but didn't care for FontBase. So far, I am enjoying NexusFont.