Specifically, I want to have the git-bash command prompt opened in full-screen mode upon startup of Windows 10.
To this end, I have added as shortcut of the program to Windows' startup folder; it opens automatically upon startup, as expected. But its window is not maximized.
My first guess was to add a certain (yet unknown) option to the invocation of the shortcut by modifying its source invocation by accessing the settings of the shorcut, as seen below. But, I don't know of such an option is available. Is there a way to uncover the available options to an .exe program?
Within the shortcut properties, on the same screen you linked above, under run: select maximised from the pull-down menu. A general rule with most shortcuts is to click on advanced and run as administrator as well.