Dansly counts both roles before every class, at the time you choose. When a side is short, it asks the dancers who fit, and the request closes by itself once the class is even.

You choose how many hours before class. 4 is the default: close enough that people still decide.
One missing follow is somebody dancing alone, so it asks at one. Raise it if your classes cope.
The class's level and above by default. Widen it to one level below, or ignore level.
Dancers who pay you, by default: a credit plan this month or a course seat. Or anyone who has joined.
No back and forth. The spot is confirmed on the tap.
If the class evens out another way, the request is withdrawn.
Filling in costs them nothing, and they choose which roles they'll cover.
It shows you that two follows are missing. Dansly also asks: the dancers who fit get the request, and it closes once the class is even.
By default Dansly only asks dancers who pay you: a credit plan this month or a course seat. And it only asks when a side is short, so nobody can count on a free class.
No. Everyone who fits sees the request at the same moment. Dancers choose which roles they cover and which days they're usually free.
No. Requests go out on their own, at the time you set. Teachers get one summary about ninety minutes before class.
Only if you allow it. It asks dancers at the class's level and above, never below, unless you widen it.
The class runs as it is. Dansly asks once and doesn't widen the pool on its own.
Put your Tuesday beginners on Dansly, leave everything else as it is, and see whether anyone still has to text round.