[Andrew Mcdonald]

In the timeline, move the playhead to the end of your clip. Select all the video tracks that contain titles you want to extend (for best results, make sure each title you want to extend is on its own, separate track) and use the Extend Previous Edit to Playhead shortcut — the default is Shift + Q. Like the name implies, this should snap the end points of all your title clips to the playhead.

Hope this helps!