If you would like to disable your device from auto rotating when you change the orientation of the handset, you can follow the below instructions.
1) Click on 'MDM Device Settings'.
2) Click on the square icon as highlighted in the below image.
3) At the bottom of the screen you will seen an option for 'Auto Rotate Screen'. If you switch this toggle off, then the device will no longer rotate when you change the orientation of the handset.
The toggle will then appear greyed out when this has been disabled. To re-enable this you will just need to click on the toggle again.