Panels
Delete Keyframes
Clear tracking keyframes across a frame range.
Movie Clip Editor sidebar, Dope Track tab, under Track. Collapsed by default, and last
of the four panels there.
The smallest panel in the add-on. It clears tracking keyframes between two frames.
Setting the range
Frame Start and Frame End, side by side, each with a Current Frame button underneath that fills it in from the playhead. Scrub to where you want the range to begin, press the left one, scrub to the end, press the right one.
Clear Keyframes
Deletes the tracking keyframes inside that range.
Useful when a track goes wrong partway through a shot. Rather than deleting the marker and starting over, clear the bad stretch and re-track just that part.