If you mean to the right, you can rather put it inside the original UI that you want at the bottom left, and have the UDim2 Position be
UDim2.new(1,5,0,0) --1 is 100% of the parents AbsoluteSize, and the 5 is for a little gap.
If you don't want it inside the bottom left UI, just do the same as you did with that UI, but just add the X Absolute Size, so like
UDim2.new(0,(BottomLeftUi.AbsoluteSize.X),1,-(UI.AbsoluteSize.Y)) |