These two functions go hand in hand, since you will often want to remove events that you have muted.
Click a note event with the Mute tool.
A dot appears in the Status column of muted note events.
The Edit > Select Muted Regions/Events command is also available in the Event List. It allows the selection of all muted notes in a MIDI region, making them easy to delete.
Click them with the Eraser tool.
Select the events, and press Delete.
Choose one of the commands in the Functions > Delete MIDI Events menu.