Can someone leave before the Liturgy of the Faithful ends?

It is stated in Canon 2.7 of the Apostles: “The deacons stand at the men’s doors to prevent anyone from going out and so that the doors may remain shut for the duration of the Liturgy, even if him who knocks on the door is a believer.” St. Basil says, “No one is to leave after the reading of the gospel unnecessarily except after receiving the eucharist.”¹⁵⁶¹