Adult only. Private by design.
What re-roll does

The button picks another full pairing. It does not start the reveal.
The short answer
Re-roll is a button on Planned pairings. Your host invites friends. The host invites friends they'd love to have there. One private link per couple. The pairings are picked at random among valid full pairings. The button is marked Host only.
Pressing it looks for a different full pairing. If it finds one, the note says New pairing picked. If only one full pairing exists, the note says there is nothing else to pick. A play party has no pairing to re-roll.
Adult only. Private by design. You confirm you are 18 or older. The host still checks you in. A private no stays private.
When the button stops
If there is no full pairing yet, the note says there is no full pairing to re-roll. The host does not type a pair in by hand.
Once the night is revealed, or a no-reveal message has been sent, the note says pairings are already settled. Couples only uses one maximum matching, so that night does not re-roll.
The planned list is recomputed from the final answers and the checked-in couples at the moment of reveal. Re-roll before that moment changes which full pairing is waiting. It does not check anyone in.
Who can press it
The host can press it. A co-host can use the same dashboard, so a co-host can press it too. A co-host still cannot delete the party or remove the original host.
Guests do not see the button. They do not get a list of who was almost paired. A private no stays private either way.
A night in Chicago can re-roll before the reveal. Dallas can too. Those cities have their own pages. The button still lives on the party dashboard.
Re-roll is not the reveal
All mutual-yes matches are revealed by the format the host already chose. Re-roll does not open that reveal. A one-sided yes stays hidden.
A key party shows one Play Partner at the same time, after the host starts the reveal. A play party keeps matches hidden until the host reveals them. A speed date is short rounds, then yes or no.
FAQ
Does Re-roll reveal the matches?
No. It picks another full pairing and waits. The host still starts the reveal.
What if only one full pairing exists?
The note says only one full pairing exists, so there is nothing else to pick. The button does not invent a second one.
Can a play party re-roll?
No. A play party has no pairing to re-roll. Matches stay hidden until the host reveals them.
Can a co-host press it?
Yes. A co-host can use the dashboard. They still cannot delete the party or remove the original host, and they do not type a pair in by hand.
When do matches show?
All mutual-yes matches are revealed by the format. A key party shows one Play Partner at the same time, after the host starts the reveal. A play party keeps matches hidden until the host reveals them. A speed date is short rounds, then yes or no.