It is easy to re-connect a moved folder (i.e. one whose drive letter or path changed). Read this:
Lightroom thinks my photos are missing—how do I fix it? | The Lightroom Queen
I would not physically move (as in copy) the files, but just point lightroom at the new location.
If you think it is at the same path as before, but lightroom still is not seeing it, I think you need to dive deeper into the problem rather than copying the files. I would start by determining exactly where Lightroom thinks the files are, and where they actually are.
Go into file explorer and find one of the files. Look at the address bar (click on it if needed) and get the exact, full path with drive letter all the way down to the folder, e.g.
f:\somewhere\my\photos\lightroom folders\niks pics
Then go into lightroom, and find out where Lightroom thinks the folder is. You can't get that with a right click from a "?" folder, but find one in the same place, e.g. in the below 20191115 is missing, but I can see exactly where 20191119 is which is at the same level, so I know 20191115 should be at t:\photos\linwood\2019\20191115.
Since you already found it you can compare, say you had something inserted, and now it is a t:\photos\linwood\2019\morephotos\20191115, you can just right click on it in lightroom, and browse to the new location.
HOWEVER, if you find it is right where you expected, then there is a different problem - permissions, corruption, or something. I would not try moving it around to fix it, I think it is better to find out why it is not appearing first. Otherwise it's like a doctor who wants to give you medicine before they ask what's wrong.
If you need further help, provide a screen shot of explorer where the folder you are looking for actually is, corresponding to the folder pane in lightroom.
HOWEVER.... and maybe I should have led with this...
Your second screen shot shows lots of catalogs. Some, like "Lightroom Catalog-3" clearly have been upgraded, e.g. "Lightroom Catalog-3-2" is how lightroom changes the name when it goes through a major version upgrade.
But the other naming quirks are created by a human, so it looks to me like you have at least six different, manually created catalogs:
Lightroom 4 catalog
Lightroom 5 catalog
Lightroom Catalog (and upgrade Lightroom Catalog-2)
Lightroom Catalog-3 (and upgrade Lightroom Catalog-3-2)
Lightroom Catalog-4
Lightroom Catalog-5
From the dates it looks like Lightroom Catalog-3-2 is what you have most recently used, but 3 others were also used in June 2019, and the naming sequence from -3 to -4 to -5 (human created I am pretty sure) is then out of sequence with the dates, as though at some point you made new catalogs then went back to using old ones.
Are you sure you know what catalogs have which photos in them?
I think most here would agree that it is generally unwise to have more than one catalog, unless you have some really, really good reasons.
Keeping the old catalog after an upgrade is usually a good idea -- but only for a while. Then remove it (or at least rename it to something like OLD_DO_NOT_USE_FROM_2017) so you don't accidentally shift. LR's penchant for just reopening the same catalog as last time means you can end up accidentally doing new work in the old catalog, which just makes a mess.
Also, once you decide to get rid of an old catalog, delete the associated folders Previews Helper, Smart Previews and Sync. Be sure to get the ones of exactly the same prepended catalog name. Previews in particular may have a lot of space taken up, and even if you did need it later it gets recreated.
But if you have been using multiple catalogs that could be contributing to your problems?