auto-generated Watchlists

Can I ask, is there any documentation defining how the auto-generated watchlists are created ?

I have a number of questions, just a quick sample below.

For example how does Trading212 decide which stocks to add to the “Top Winners” watch list ? “

Are they literally the 10 with the biggest % increase or a sample from different industries ?

Does it look at the entirety of the trading day ?

How does it decide when a stock drops off the list ?

Grateful for any insights.
Thanks !