Have you seen the data section in https://make.powerapps.com?
To me it is replacing (in part) the old customisation section in settings. If you click on the Entities section you will see all of the entities you have in your environment so you can update anything entity wise from outside a solution.
The option set doing exactly the same. Click to see everything and you can go straight in an amend.
As with all of the new features (I’ve played with so far) in powerapps you have the search field on the top right making it easy to find and update. Potentially too easy as based on the format of the screen it you could easily be in a solution and see option set on the left hand menu, go and click in there and the change is in the full system not the solution.
That aside (it’s a learning process so if you are aware of it fingers crossed you wont do it) the clean screens and easy process to see all the information, not forgetting my wonderful friend the search. It is another of the new features that after using once I have stayed there rather than going back to the old format.
My ending question, has anyone else been exploring the data sections ? (still another post to come on data import) Is there anything else you have found good or bad?