To restore the OS disk from snapshot you can do the following:
Navigate to the snapshot and select Create Disk
Navigate to VM select Disks under settings then select Swap OS disk
Select the disk you just created from the snapshot. This will shutdown the VM and swap the OS disk. Once completed you can start your VM and test.
Hope this helps! Let us know if you are still facing issues or have further questions.
-------------------------------
Please don’t forget to "Accept the answer" and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.