is your character level 1? level 1 characters can't do some things.
it's level 7. Just now, though, I managed to get it working.
Beforehand, the icon tray options, while in the space map, full impulse speed was not an option (though it should be an option,), then just now, as I started to test the entire project out, from the beginning, instead, I thought I'd look into the icon options while in that area, in sector space.
It was there! So I dragged it into the tray, locked . Then began to test the entire mission, and thankfully it has remained in the tray (and options area), though beforehand, it was not even an option , while testing my space maps.