Overlap
Allow overlap controls whether a rule can stamp the same line more than once.
Off (default)
Once a rule matches a row or column, that whole line is considered handled — the rule won't test it again, even for cells its stamp didn't touch.
On
Every cell is tested, so multiple matches along the same row or column each produce their own stamp.
When using Insert Before or Insert After modes with Overlap on, a new row or column is inserted for each match. Multiple matches result in multiple insertions.
note
Overlap is scoped to a single rule. Two different rules can still both format the same cell.