There are some functions in the addon that might be either confusing or obscure for a good number of players, and it might be a good idea to look at keeping cohesion between what an input does across most editors in Extended, as well as making some more unclear features more visible. Some examples :

• Right-click can sometimes mean "Delete this element", sometimes opens a dropdown for additional options.
• It could be made clearer that you can access the quick item editor directly from the inventory.
• Tutorial buttons don't feel as visible as they should be, despite using the default style (might have to do with the addon color scheme ?).