BRING IT BACK! Color Balance (RGB)

Ain't happening. Guaranteed. They're cleaning up the app from all the old crud, and that effect is old crud.

You can do anything you did with it, and just as fast, in Lumetri, without doing anything else in the Lumetri panel.

Is it a wee bit different to figure out, at first? Yea, might take ten minutes. 

And I'd be happy to suggest how, both to get the same result and to get that fast, if you give the media and how you worked with Color Balance RGB. As everyone always does everything differently.

Ignore the best answer and most comments specific to the grid, the answer (for you) is in this thread:

https://community.adobe.com/t5/premiere-pro-discussions/fx-video-grid-gone/td-p/14812036/highlight/true/page/2