It's a little Off topic but here are some LUA Commands to change Scale of InGame interface (TEMPORAL)
/run MainMenuBar:SetScale(1)
/run PlayerFrame:SetScale(1)
/run TargetFrame:SetScale(1)
(1) = Scale modifier ( 1 = 100% , 2 = 200% , etc..)
/run print(GetMouseFocus():GetName())
This will print name of UI part that you are mousing over by cursor so you can try to use this printed name with :SetScale(1)
.. may it be usefull ..