So after using the Ctrl+J method to make 1 object out of multiple ones I first thought: oh. nice.
In edit mode I sadly realized that the 1 object is still made up from several different parts. It is not like I think its looks ugly or anything. But editing and sculpting is really annoying when its like that. Needing to select the faces one by one etc.
How can I make my object just actually be 1 object without being made up from several parts?
Notes: - I don't have the object non-combined any more. that means I saved after doing Ctrl+J and I can't undo it.