At work, we've been pushing everyone to use an app called clockwise. Basically it integrates with your calendar, moves meetings around (with your approval) to maximize focus time (2+ hour blocks of work).

It also allows you to set up "Do not disturb" on slack during your focus and meeting time. It's awesome.

(BTW, no personal association with the company, just a happy user).

https://www.getclockwise.com/