#1. In Writer, is there a way to select an already numbered list, and then click on just one button to simply remove all numbering? So far, I see only how to substitute bullets for the numbers. Remove is grayed.
#2. In Writer, is there a way to select an unnumbered list with a blank line between each item, and then select numbering in such a way that the numbers appear only in the lines with text, and not in the blank lines as well?
If you have used the direct formatting button or F12 then simply selecting the list and clicking the button again will remove the list.
If you have applied the list with a dedicated paragraph style, then simply changing style back to Body Text will remove the list.
If you don’t want a paragraph numbered within a list then click just after the number or bullet and press Backspace key. The paragraph will keep the same indent but not have a number.
There is more in the Writer Guide, download from English documentation | LibreOffice Documentation - LibreOffice User Guides