Hi,
Thank you for writing to Microsoft Community Forums.
We understand the concern as you are unable to find Sandbox on your Windows 10 Pro PC.
In this case, we would suggest you to run SFC scan and after completion attempt to enable Hyper V and check if you see Sandbox,
refer this article:
System File Checker
We would suggest you to perform the steps as mentioned in these articles and let us know the result:
Windows Sandbox (perform step 2 under
Installation section)
Install Hyper-V on Windows 10
If the issue persists, then
we would recommend you to download
Windows 10 2004 version
installation media (ISO) using the media creation tool on the desktop of the PC and then refer this article by PaulSey to run an
in-place
upgrade.
Note: Please backup your important data that are saved in C drive to any other
local drive or external drive before performing In-place upgrade.
Let us know the results. If the issue persists, we will certainly assist you further.
Aditya Roy
Microsoft Community – Moderator