Upgrading the macOS over any older version commonly corrupts Font Book's database. Then you see issues like that. Such as, Font Book shows the font in its list and says it's active, but you can't see the font in most, or any of your apps.
Did you try the steps for resetting Font Book earlier in this topic? That's usually all it takes to fix such problems. Here they are again:
Close all apps, particularly Font Book. Go to the Library folder of your user account. Open the Preferences folder. Put these two files in the trash.
com.apple.FontBook.plist
com.apple.FontRegistry.user.plist
You many not find both. It depends on whether or not you've deactivated any fonts with Font Book.
From an administrator account, open the Terminal app and enter the following command. You can also copy/paste it from here into the Terminal window:
sudo atsutil databases -remove
Terminal will then ask for your admin password. As you type, it will not show anything, so be sure to enter it correctly.
This command removes all font cache files. Both for the system and the current logged in user account. After running the command, close Terminal and immediately restart your Mac.
Another known issue that's been around since El Capitan is there are five OS supplied fonts that simply do not show up in Apple's apps. Six now in High Sierra. From my article:
The five (now six) fonts that will not work properly in El Capitan or Sierra (Athelas.ttc, Charter.ttc, Marion.ttc, Seravek.ttc and SuperClarendon.ttc) continue to be a problem in High Sierra. The issue was momentarily fixed in Sierra, but they went missing again as of 10.12.2. These five fonts remain in limbo with High Sierra. Iowan Old Style.ttc has joined this list in High Sierra.
When I first tested the original five known problem fonts upon High Sierra's initial release, renaming the fonts still worked. One of the recent updates to High Sierra caused renaming the fonts to stop working. It made me wonder if removing the buried .ATSD and .fontinfo data still worked.
I booted into Recovery mode to turn SIP off, then removed all of the info data for those fonts. Nothing! Not after a restart, clearing font caches, or renaming the fonts on top of removing the data info. None of Apple's apps will recognize these six fonts as being on the system. Microsoft Office, Adobe's and everybody else's software does. Just not Apple's.
At this time, the only fix is to copy these fonts from Yosemite and completely replace the High Sierra versions. That is, if you need to use these six particular fonts in Pages, TextEdit, or whatever Apple software you're using.