With the quick release built into the DJI propellers you can replace the propellers on your DJI drone in seconds.
This method applies to the Quick Release propellers for DJI Mavic Air, DJI Mavic Pro (including Mavic Pro Platinum) and DJI Spark drones.
Un-fold your Mavic Air drone and place it on an even surface. Now, identify the propellers with the white line marks on them. They will be placed diagonally one in the front and other, diagonally at the back.
Note: in case of Mavic Pro, Mavic Pro Platinum and DJI Spark drone the Quick Release Propellers will be marked with a white circle and DJI Mavic Pro Low Noise Quick Release Propellers with a gold circle.
Using two fingers push the propellers down with one hand and using the other rotate the motor clockwise for propellers with the white line and counter-clockwise for the propellers without the white lines. This will release the propeller lock and they will pop up.
Note: place your fingers closer to the centre of the propellers, roughly where the arrows are in the below picture. Pushing down the propellers towards the edge may lead to breakage.
Similarly, to put the propellers back on, make sure you place the propellers on the motor pin, press down on the propellers and rotate the motor counter-clockwise for the propellers with the white lines and clockwise for propellers without the white line.
Make sure to match the propellers with the white lines to the motors with the white lines.
Note: The images in this post illustrates removing quick release propellers on the DJI Mavic Air but this will be the same for other DJI Drones like the DJI Mavic Pro, DJI Mavic Pro Platinum and DJI Spark drone. However the propellers markings on the Mavic Pro series and DJI Spark differ and are noted above.