Ensure "Enable Custom Content and Mods" is checked.
The number one reason players can't see their CC is that the game has automatically disabled them. This happens every time Electronic Arts (EA) releases a game patch or update. Go to Game Options > Other.
If you've checked everything above and it still isn't working, try the : Move your entire Mods folder to your desktop.
The Sims 4 is very picky about where files are stored. If they aren't in the exact right spot, the game engine simply won't "look" for them.