Reduce GP window size to use 3 instances on the same screen?

I’m working on a set where I need to use 3 instances of GP with 1 panel on each.
I’m would need to display these 3 instances panels on my laptop screen without them overlapping.

is there a way to force to reduce the window of GP instances?
or is there any soft wich could allow to do that?

thank you!

Maybe that helps

or this