You may have to adjust compatibility settings for Altitude if you are trying to play on a high resolution display such as qHD or 4K monitors. Windows 10 does not scale Altitude properly on high resolution displays and you need to disable Windows 10 display scaling through compatibility settings. If it seems like you are not seeing the full Altitude menu after launching or there are black bars on both the top and bottom of the screen, follow these instructions:
If you downloaded Altitude through Steam, from your game library right click on Altitude and click Properties. In Properties select the Local Files tab and then Browse Local Files. Find altitude.exe in the local directory and click Properties. Go to the Compatibility tab and you should see an option to Override high DPI scaling behavior. Check the box and make sure the drop down is set to Application.
If you have the standalone version of Altitude simply right click on the shortcut on your desktop or in your start menu and go to Properties. Then adjust the high DPI scaling behavior as described above.