Thanks for reaching out to Microsoft Q & A Forums ,
Speaking of your question :
You cannot combine Disk 1 and Disk 0 or take the volume from Disk 1 to Disk 0 since Disk 1 and Disk 0 are two different physical discs.
My suggestion would be to increase your OS Disk size from the Azure portal/CLI and allocate that space to the C:
Ref: https://learn.microsoft.com/en-us/azure/virtual-machines/windows/expand-os-disk
Hope this helps in your use case.
Thanks & Regards,
Pradeep
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