With Double sessions, you can select dates and sessions the league should play, and the league generator will reserve those selected dates and sessions but automatically also reserve the next session straight after.
Both sessions will be used for separate matches.
With this option, divisions will still be mixed.
There is a risk that a team will have 2 matches on the same day. In this case, the match will be highlighted in red on the league generation page.
When this happens, print this page, proceed with writing the league to the diary, then manually move the problem matches via the diary.
If you require the divisions to play separately, use Not mix divisions.