The ‘hit zone’ for changing from px to pt to % etc, is too wide and too close to the right side of the numeric value such that it makes it frustratingly hard to use, forcing you to be very precise and slow when you want to drag select the old value and type a new value.
Here is a zip file of a 20sec video highlighting the problem with the UI/UX.
BoxTooHardToDragSelectRightToLeft.mov.zip (1.5 MB)
Thanks!