Question dragon relocation

[Kant]

Why does crew 1 have to relocate? why cannot crew 2 dock on to the space facing port?

 

[Catastrophe]

NASA
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On Monday, April 5 starting at 6 a.m. EDT, watch the first-ever port relocation for a U.S. commercial spacecraft! Four astronauts will undock their SpaceX Crew Dragon "Resilience" from the International Space Station's Harmony module forward port, and take a short ride to redock at Harmony's zenith, or space-facing port. The autonomous relocation maneuver, taking about 45 minutes, will prepare for the arrival of NASA's SpaceX Crew-2 astronauts in late April, and the upcoming delivery of new solar arrays this summer. Astronauts Michael Hopkins, Victor Glover, and Shannon Walker of NASA and Soichi Noguchi of the Japan Aerospace Exploration Agency will be aboard the spacecraft.
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