Press Space to draw a line. If it's within the Angle section, you'll need to specify the angle, side, and arc. Controls may be different if you're not on a PC. IF CONTROLS DID NOT CHANGE Reset the Project and It should change again! If this did not work, Why not see inside, Then, you have to set "Mobile Draw" as visible. If you're on a PC and there are Mobile controls. Ignore Editing, Just Click the button. or Press Space to draw.
