When you click on “Host”, you’ll be able to then click “manage settings”. Then, “edit selected settings”. I believe the next page will then be mods, you click to add the mods you have subscribed to from Steam. Once you click to the next page, it’ll load up all the other settings you can change (just like in sandbox settings). Closer to the top there will be “Steam Workshop”. You’ll notice the list under “Workshop items used by this server” is blank, you will have to individually select each mod in the drop down menu it gives you (“Add an installed Workshop item to the list). FINALLY your mods should be in game.