I develop on Windows, Mac, and Linux. The Anchor Editor is very helpful in placing controls. However, selecting a Form height that works on all platforms is challenging, as the Form bottom can not be anchored to a contained control.
Currently I use a class that determines the bottom of the lowest control, typically an OK button, and then set the Form Height to that plus a margin. This is done in the OnShow handler and works pretty well, but seems a bit of a kludge.
I wonder if I am missing something obvious.