You can always hold positions from Friday to Monday. Trading on Saturday and Sunday needs the Weekend Trading add-on.
Action on Saturday or Sunday | Without add-on | With add-on |
Hold an open position | Allowed | Allowed |
Move your stop loss or take profit | Allowed | Allowed |
Open a new position | Violation | Allowed |
Close a position, including a stop loss or take profit being hit | Violation | Allowed |
Leave enough distance on stops and targets held over the weekend, because a fill on Saturday or Sunday counts as weekend trading.
Consequence: in evaluation the account may be reset with your free retry or reinstated. On a funded account it is reset and the current cycle's profit is forfeited.