Is there a keyboard shortcut to switch to the other split screen?

I don’t like dragging my mouse across to click somewhere on the other split screen to get my cursor there. Any keyboard shortcuts for this?

There a couple ways to do this. I assume you’re using the Scrivener for Windows v3 shortcut settings.

Win + Alt + E will bounce the focus from Binder (if it’s displayed) to L Editor to R Editor (if it’s displayed).

Win + [ will move focus to L Editor, Win + ] to R Editor.

These and other focus shortcuts can be found under menu item Navigate > Move Focus to.

Finally, you can modify these shortcuts via File > Options > Keyboard.