Please announce this prominently to users BEFORE it changes
Ok. This is a bit late, but Today I got the 'June 2018' UI change. I always need some time to adjust, and it would make my life a lot easier if I was greeted with a popup / hint / link somewhere explaining the changes; and ways to change stuff back (if possible).
When Google makes bigger UI changes, it almost always explains the changes or even announce the changes so they don't hit that hard when they arrive.
Could you please, please, please next time announce (in the face) it before it happens?
For example: to switch to the 'new' UI:
