Is there a way to just view the posts from the communities I'm subscribed to? I thought I saw someone mention that it was possible to make that the default view, but I can't see anything in the settings which looks like it would do that.
I've just done it. Tap explore in the bottom Tab bar. Under "feeds" you can switch to "subscribed" and if you use the 3 dots next to subscribed you can set it to default.
Open the drawer, if using drawer navigation or the bottom bar if using bottom bar navigation and tap explore, then you'll see subscribed and local are options, you can tap the three dots next to each to make it the default.
If you open the drawer menu, you will see the three feeds near the top of it (Everything, Local, Subscribed). You can also click the ellipsis menu here and change the default view to Subscribed, if you want.