@kandykane123 None of these packs are actually installed. The Delta folder holds patch data for all packs, and that data gets installed regardless of whether the user has installed or even owns the corresponding packs. If your packs were installed, you'd see their folders directly inside a "The Sims 4" folder as well.
Did you buy these packs from Steam, from Origin or the EA App, or from a third party? If you bought or registered them in Origin or the EA App, you'll need to install them through the EA App: login there, open your game library, click the Sims 4 icon, select Manage > Manage Add-ons, and click Download for any packs you see. If you have two entries for Sims 4 in your library, try the one with the Steam logo on it first.
You don't need to install the Sims 4 base game through the EA App, and in fact that would be counterproductive if you want to keep playing through Steam.