Mouse Speed

Is there a way to slow down the speed of the mouse in general?

I’m not talking about event-specific movements, but just general slowing of the mouse speed.

Editing the Project Settings > Inputs doesn’t seem to help.

It depends on the reference you need. I would not slow the mouse speed down if you are using it in a gui. I would slow it down if it is zipping way to fast in a fps. You can do that by using a multiplication modifier in the code that controls the mouse look.