UV Editing Tab Export Help?

I follow everything in this video up to around 2:20. When I do fiddle around with it, the UVs vanish (presumably because I’m no longer in editing mode). How do I export textures as pictures?

This isn’t a VRChat specific question, but once you have an image texture opened in UV Editing in Blender, go to Image - Save As… (Shift + Alt + S) to save it.