Changing Serial Monitor window default size (Mac OS)

On Mac OS 10.14, the default size of the Serial Monitor window cannot be changed via editing ~/Library⁩/⁨Arduino15⁩/preferences.txt. The current default size and also the minimum size are considerably larger than would be appropriate, especially on smaller Screens (such as the 13" MBP).

This should be editable according to the settings for the editor window, with commands such as:

serial.window.height.default= ...
serial.window.height.min= ...

etc.

Start by locating the Mac OS Serial Monitor window implementation and compare its current default and minimum sizing with the editor window settings. Review ~/Library/Arduino15/preferences.txt behavior and verify that separate serial.window.height.default, serial.window.height.min, and corresponding width settings can be honored; done means smaller Mac screens open with the configured sizes.

Written by the indexing model from the issue text.