You can also set the begin to before the end Ctrl-k + k "set block begin/end" => the old ones.
That suggestion put me on the right track. Ctrl-k + h turns the selection off.

What would be "invert"?
Whatever was selected gets deselected and whatever was not selected, gets selected.
Yes, that can cause more than one area to be selected but, not always. For instance, if the first line of a file is selected then inverting it, selects the entire file, except the first line.
It's usually handy to exclude some text from being searched.
Thank you Martin. That helped.