You can change the margins both above/below tacets in each layout independently; for example, if you want smaller gaps between flow headings and tacets in some layouts to facilitate page turns better.
Procedure
Result
Changing the value for Margin above tacet increases/decreases the minimum gap between tacets and whatever precedes them.
Changing the value for Margin below tacet increases/decreases the minimum gap between tacets and whatever follows them.
Tip
You can change the default padding to the right/left of tacets, show them with/without a border, and change their border thickness project-wide by editing the Tacet paragraph style.