You can find options for the project-wide appearance and position of vibrato bar dips, vibrato bar scoops, and tapping, hammer-on, and pull-off indications on the Guitar Techniques page in Engraving Options.
The options on the Guitar Techniques page allow you to change the appearance and default placement of tapping, hammer-on, and pull-off indications, the positions of vibrato bar dips and vibrato bar scoops, and whether each guitar technique appears on notation staves only, tablature only, or both.
The options are accompanied by diagrams to help you visualize how they affect the appearance of your music.