Issue with very large move/scale arrows

Hi, apologies for this being a very beginner question as its probably an easy fix, i just started using unreal 2 weeks ago at college.

Im having an issue since booting up today (this wasnt happening last night) where all my arrows for moving, scaling etc are incredibly large.


I also have to double click on everything to select it and my project has got all messed up. I even uninstalled and reinstalled but to no avail.

I have also tried pressing - or = which someone suggested to scale the arrows down.

Thanks in advance