As many people have been saying, the coach should let the kids make their own decisions on the field, but pull them off to talk to them when needed. Also talk to the kids on the sidelines, to inform them as they watch. Talk to the kids off the ball, if needed (ie, tell defense to come up a little or ask one to look where he's positioned himself, if he's far out of position.)

When they do something really good, yell out to acknowledge it. This is MUCH more effective than yelling when they're doing something wrong.
The kids won't talk to each other as they should if the coach keeps yelling instructions.

I have never found yelling at the kids to make more of an effort to be effective. Most effective is subbing kids out when they're not making an effort.

2018 article by a Stoddert parent coach about sideline yelling by parents
https://slate.com/human-interest/2018/05/silent-soccer-is-great.html

In the "coaching soccer for dummies" book, they point out that in little-kid soccer, that people are prone to yelling "spread out!" which is very unhelpful. At that age, you want them to learn to fight for the ball, so developmentally the swarm isn't as bad as it looks. Here is another article about what NOT to yell at the kids: https://www.ayso64.org/Default.aspx?tabid=862219

The best coach we've seen had one general theme of coaching during the game--"increase your effort" or "give us a better effort" or "good effort". It was only about encouraging the kids to play harder or stronger or smarter, not about a micromanaging of where they should be and who should do what.

That said, at halftime, they did discuss some formations and things to watch for in the second half.

I'm going to say not the style that my child's current coach has, which involves giving many speeches about how the kids are not working hard enough and are failures. I can't believe I'm paying $2K for this.