When creating a new shape, if you right click and hold to move the camera, Pro Builder is taking that as an input and either: a. Using that right click spot as the first point on a new mesh b. If a new mesh is already created, right clicking and then clicking into one of the New Shapes size properties, any value you enter will be ignored. For example if it is a size 2.6, you right click to change camera then click back into that size field and change it to 5, nothing happens. Tested against 2020.3.37, using 5.0.6 Pro Builder as well, and it does not treat a right click as an initial selection but rather snaps back to your cursor after finishing as expected.