Ive done the tutorial i used to randomise tile textures to get thay realistic look so they dont look flat. Now i need to rejoin the meshes so i dont have over 400 objects. I did it once where it was bounded by an instance collection that didnt matter if the original was deleted and it became one un-editable block but I cant rmbr how and it wasnt Ctrl J because it lost all the randomization and Ctrl L seems not to work?
Help : Need to join elements to make file smaller but cant remember how..not Ctrl J or Ctrl L but..?
If you have a modifier making the randomness you probably need to apply it. Then do the joining.
What you are likely to be doing is applying the randomness of the active object to the rest when you join them together.