Manage Worlds and Loading Screens Not Working

@RandomUser0403I think it's adding to the size of the game and in particular I'm finding For Rent is generating a lot of new townie households. I'm constantly checking the number of townies in OH and culling over a dozen at a time. They can cause massive issues on console. Mine had almost doubled in size. But I like the pack so far. The patch prior to it's release caused even more issues than the pack itself did for me unfortunately.
But sadly that many library saves is known to cause problems and I keep a backup game save instead of filling the library. I went through it with Microsoft Support who also explained it to me as I started getting an error code. It was with only a few packs the first time it happened. With the whole game except Vampires now it runs better with a minimal library. I'd advise that rather than disabling a pack you've spent so much money on.
For example, with the library I recently tried making a room for each Eco Lifestyle fabricated furniture/decor/dyes/lighting colour so I could keep each one in my library and make instant fabricated homes. By the time I'd created each room in each shade and saved them in the library I had big problems. My library caused my game to lag and freeze up, loading screens were grinding. I cleared it and immediately my game performance improved. (Luckily I still have the items in my retail lots and can do them individually when I want my fab homes). I get an error code saying something about saved data not matching, or words to that effect when using the Library too much. When downloading from the Gallery I get an error code that wipes my saves and stops me making new saves until I wipe my entire game and start again. I upload to it though then at least I know my creations aren't lost entirely.
I firmly believe the library and indeed the Gallery is a problem on console and I hope the stability is looked into at some point because it's a useful resource. I've had these issues on 4 consoles.
Anyway good luck. I hope this does help your game run properly it's such a shame you're missing For Rent. It's a great pack for builders. Keep an eye on this thread:
https://answers.ea.com/t5/Technical-Issues-Consoles/bd-p/the-sims-4-technical-issues-consoles-en

With the rental lot problem you mentioned btw, try going to the lot first from manage worlds and bulldozing it. You might need to evict occupants first if it's not empty. Once it's bulldozed change it's lot type and then start again. That works for me. If it won't let you change the lot type still, you can try the cheat bb.enablefreebuild. If you haven't used that before it's safe to use without disabling Xbox Achievements as it doesn't require testingcheats to be entered first. To open the cheats menu hold down the bumpers and triggers together until the box pops up.

And come back to us with any problems. Always here to help! Good luck.