You can find options for the project-wide appearance and position of figured bass on the Figured Bass page in Engraving Options.
The options on the Figured Bass page allow you to change the default appearance and position of figured bass in different circumstances, including for avoiding collisions. For example, you can set the default combination of figures and alterations you want to show for different intervals, whether to notate raised and lowered figures with accidentals or slashed figures, and whether accidentals appear before or after figures.
You can change the appearance of tasto solo indications and figured bass brackets, including their thickness and whether they are round or square.
You can also set the circumstances in which you want to show hold lines, how many hold lines you want to show, and where to position them.
Your settings in the Figures section are used when your figured bass input setting is Follow Engraving Options.
There are musical examples for many options to demonstrate how they affect the appearance of your music.