Good
It is safe to select the
Rosser 150117 (2) project and use
More Tasks > Delete Project.
Just review the resulting dialogue with some care.
But there is no harm in keeping it until you are more comfortable with its deletion.
To get rid of the spurious projects use
File Explorer.
I believe there is a
New Volume(E:)\Family Historian Projects folder as shown in your first screenshot this morning.
It sits alongside
Documents and
Downloads and
Euro Truck Simulator 2.
It contains only
Rosser 150117 and
Rosser 150117 (2) but NOT
Family Historian Sample Project.
Right-click that
New Volume(E:)\Family Historian Projects folder and choose
Delete.
It will only go to the
Recycle Bin so can be retrieved if necessary.
You could perform a
File Explorer search for
"Family Historian Projects" to see if there are any other spurious entries apart from the
E:\Documents\Family Historian Projects master folder.
Just double check that your three
FH V6 Projects are still OK.
Now, as I said earlier, make a note of your
E:\Documents\Family Historian Projects master folder, and how to set it as the
File > Project Window > Location: while still fresh in your mind.
After a
Google search it seems that duplicate drive listings is a common problem in
Windows 10 File Explorer.
But the fix requires a
Windows Registry hack that I do NOT advise you attempt.
Either live with it (apparently does no harm) or ask your PC expert to investigate.