How much should the U7 coach actually watch instead of coach?

That is a good discipline for the coach. You will see ten things in every six-minute game. The players cannot use ten bits of feedback. I would pick one or two themes for yourself before the morning starts. Maybe today you are watching how they react when they lose it, or whether they create any space away from the ball. That does not mean you ignore everything else; it just stops every mistake becoming your next intervention. A lot of your notes can stay in your head and shape Tuesday’s training rather than being delivered on Saturday. Sometimes the best response to a poor first touch is simply letting the player have another first touch 30 seconds later. 3v3 creates repetition. Coaches do not need to fill every repetition with words.