Mavic 3 Enterprise Atti Mode
When you at the main menu, go to enter camera view then click the 3 dots in the top right hand corner.
Navigate to the aircraft menu and turn on Multiple Flight Modes. This will give you a warning.
Once confirmed, you can now switch to ATTI mode. The slide button in the middle of the controller above the screen is your mode button.
T is for Tripod, N is for normal and S is for sport. Once you have enabled multiple flight modes, Tripod becomes ATTI mode. Slide the button to T and it will switch to ATTI mode.
Please keep in mind Sport mode is obviously quicker but also all sensors are disabled. In ATTI mode you do not have a GPS lock and the drone will drift with the wind. It will however try to hold its altitude.
You also do not have sensors enabled in ATTI mode!