Hello anonymous user ,
Please try out the below command to disable the JIT access on a specific VM in a specific ResourceGroup under that region
Remove-AzJitNetworkAccessPolicy -ResourceGroupName "ResourceGroup" -Location "Location" -Name "NameOfTheVM"
I just tested it locally by creating 2 VMs and after enabling the JIt on 2 VMs tried running the above command to disable JIT on one particular VM and it works perfectly!
Before:
After: