When I click the "Push" button in the SourceTree window I get a window asking me to select the desired branch and at the bottom of this window there is an option to "Force Push" (which is necessary after a rebase). Unfortunately, this option is grayed-out and I am not able to select it. Why is this option not selectable?
I'm using SourceTree version 2.4.7.0 for Windows on Windows 10.