Pretty much as VapechiK says. Here's a how-to list based on your screenshot at the top of this topic:
Create a folder, e.g. called "mounts" or "disks" or whatever, in the root of any physical drive that ISN'T your drivepool and IS going to be always present:
You might use your boot drive, e.g. c:\mounts
You might use a data drive that's always plugged in, e.g. x:\mounts (where "x" is the letter of that drive)
Create empty sub-folders inside the folder you created, one for each drive you plan to "hide" (remove the drive letter of):
I suggest a naming scheme that makes it easy to know which sub-folder is related to which drive.
You might use the drive's serial number, e.g. c:\mounts\12345
You might have a labeller and put your own labels on the actual drives then use that for the name, e.g. c:\mounts\501
Open up Windows Disk Management and for each of the drives:
Remove any existing drive letters and mount paths
Add a mount path to the matching empty sub-folder you created above.
Reboot the PC (doesn't have to be done straight away but will clear up any old file locks etc).
That's it. The drives should now still show up in Everything, as sub-folders within the folder you created, and in a normal file explorer window the sub-folder icons should gain a small curved arrow in the bottom-left corner as if they were shortcuts.
P.S. And speaking of shortcuts I'm now off on a road trip or four, so access is going to be intermittent at best for the next week.