Crew Dragon only has 4 seats per SpaceX, as the requirements changed during development.
"After SpaceX had already designed the interior layout of the Crew Dragon spacecraft, NASA decided to change the specification for the angle of the ship’s seats due to concerns about the g-forces crew members might experience during splashdown.
The change meant SpaceX had to do away with the company’s original seven-seat design for the Crew Dragon.
'With this change and the angle of the seats, we could not get seven anymore,' Shotwell said. 'So now we only have four seats. That was kind of a big change for us.'" - Dec 2019 Space Flight Now article with SpaceX COO Gwynne Shotwell
https://spaceflightnow.com/2019/12/...ish-line-is-in-sight-for-spacexs-crew-dragon/