Can't delete

Ended up with a violin section that has two treble clefs. No idea how. An hour trying to delete the part with no success. Best I could do is select the entire part and hit delete and/or ctrl delete. That resulted in deleting everything. Nothing left but a white page. Another hour trying to get down to just one treble clef. Again... no success. Ended up hiding the whole thing, two bass clefs, an instrument with no name for the part etc. etc.

I list two examples below:

Open the Parts dialog (File → Parts…);
Select the relevant Part in the "Parts" pane;
Press Delete. " DOESN'T WORK NOTHING HAPPENS

Remove instruments from a part
To remove instruments from an existing part:
"Select the part in the "Parts" pane.
Select the instrument from the "Instruments in Part" pane.
Press - to remove the instrument. " DOESN'T WORK. CAN'T SELECT FROM BOTH PLACES AT THE SAME TIME. GET A LOT OF BEEPING ETC.

I'm hoping there is a better suggestion. How can it be so hard to simply delete a part from my list of instruments? I don't get it
JOhn