For scorecards you can only print a maximum of 4 players per game!!!

In golf, 1 game is always a maximum of 4 players. All programming from scorecard printing to calculations of all kinds are based on this.

However, there are often ideas to start games of 6 players, e.g. 2x 3 players as a scramble. You can achieve this by manually editing the start list.
If you want to start the 6-player game 12 minutes apart, make a scramble with 3-player games 6 minutes apart and change every 2nd start time (similar to the cannon start with 2 starts on 1 tee) to the same start time with game B

Have a look here: Click in the „Time“, change it and confirm with „Move only this time“