I can tell you how to do so, but you have to create a Ventoy device first. This thread deals with Windows PE, not Ventoy.

Post your questions about Ventoy there: Ventoy iso bootloader EASY...

I have only one internal drive.

On my Windows 10, I am the only user, who has only one account.

On installed Windows 10, I emptied Recycle Bin.
I restarted my PC and booted it from WinPE.
On WinPE, I saw a lot of items in Recycle Bin, i.e. C:\$Recycle.Bin\ and D:\$RECYCLE.BIN\

Has anyone...

Do you mean the committed memory is on "Boot (X:)"?

353620

I am now running Win10XPE created via "Win10XPE_2019-11-20.7z".

353619

The committed memory is 6044 MB.
Assuming the committed memory is "pagefile.sys", where is it on Win10XPE? It does not...