How do pre-tribulationists interpret the sealing of God's servants, does it happen before or after the rapture?

In Revelation 7:3-4, God seals His servants before the tribulation begins. Since pre-tribulationists believe the rapture occurs before the tribulation, how do you interpret the sealing of God’s servants? Does this sealing take place before or after the rapture, and how does it align with the pre-tribulation timeline of Christ’s return?