May I make some suggestions;
A button to be added to start the compare instead of it starting automatically.
I usually select the model (which starts the compare), then realise I should have changed the items to compare.
After a compare is completed, switching to the settings tab and back without make changes should not start a another compare
On the settings, if you deselect all, then decide to select (for example) entities, you then have to expand entites and select all the sub items and again to the lower level.
Maybe reselecting entities should automatically select the child items since most would be required.