You can find options for the project-wide appearance of tuplets, tuplet brackets, and tuplet numbers/ratios on the Tuplets page in Engraving Options.
The options on the Tuplets page allow you to change the appearance and angles of tuplet brackets, and the position of tuplet brackets, tuplet numbers/ratios relative to the staff and noteheads.
There are musical examples for many options to demonstrate how they affect the appearance of your music.