Player Start invalid

I used UE’s Player Start and dragged it into the scene, but it didn’t produce any effect. What is the reason for this?

Do you also have a DynamicPawn in the level? If so, I’m guessing its location is overriding the Play Start Actor.

What you said should be right
Can DynamicPawn modify the middle key rotation?

I’m not sure what you mean. Please tell us in more detail what you’re trying to do.

I want to modify the DynamicPawn operation mode. Currently, the default is to rotate the left mouse button, and I want to modify the middle mouse button rotation

DynamicPawn is no different from Unreal’s standard DefaultPawn in this respect, so any Unreal tutorial on this subject should be able to show you how to do it.