I only use 3 of the selectable flight modes in QGC drop down listing of flight modes. How can i hide or remove the flight modes I do not want to be available/seen?
As far as I know, there is no way through the user-interface, for this you would have to compile your own QGC. Is this way okay for you?
Do you know how to compile custom versions of QGC? I can pay you for work on QGC.
You should review the QGC dev guide on how to create customs builds and then use this: https://github.com/mavlink/qgroundcontrol/blob/master/src/FirmwarePlugin/FirmwarePlugin.h#L86