>>289363985
Google Manual Atlas Tutorial, I think Tupper did one and it's in the pastebin?
UVPackMaster Pro is an add-on for automatically pack UV's, it's paid for but works really well. Else you can use Blenders packing tool, but it's not as good.

Here's some tutorials for it, Texture Atlas is a free Blender Add-on you need to enable in Blender, kinda like Cats.

First tut is just kinda to show how it works, second one is longer but shows how you can use Pack to others for way better control over Texture Size etc in the Atlas. I recommend watching both.

https://streamable.com/wsbfww
https://streamable.com/2j3lw3

Heres the add-on UVPackMaster, not latest version and dunno if it works with 2.8
https://gofile.io/?c=oxBIsb

pic related is a Frame Arms Girl