Hi Harshit Dwivedi,
Thank you for reaching Microsoft Community. I understand that you are having issues on your Surface Pro 9 where it does not enter tablet mode whenever the typecover is detached.
We would like to ask for a few more details on this for us to further isolate:
- May I know which Surface Pro 9 configuration do you have? 5G or Intel?
- What Windows version, edition and OS build is your Surface running on? To check, go to Settings > System > About and see under Windows specifications.
- Also, please provide us also the current firmware installed. Open the Surface app, select Device Information then take a screenshot of the details and share it to us here but please hash first or hide the serial number.
For now, please try first doing a force shutdown on the device by pressing and holding down the power button for 20 seconds to clear the hardware cache of the device. If issue persists, please run also the Surface Diagnostic Toolkit on the device to run some system checks and repairs.
Let me know how it goes.
Kind regards,
Marrion