@dangerousdids Unfortunately, the in-air start is something that the 146 Professional doesn't currently support as I seem to recall there was an issue on the simulator side that prevented us from getting that working in previous versions of MSFS.
It has been a while since we last looked into that though, so we will investigate this and any improvements we will be sure to include in a future 146 Professional update.
In the meantime, if you would like to fly circuits around an airport to practice landings, we would recommend loading the 146 on the runway, where the aircraft will already be fully configured for takeoff, and then taking off and flying a circuit back around to rejoin the approach.
Mark - Just Flight