This option used to be named Start date, and was used to set the start date or dates of the league. We have updated it to 3 distinct options:
For leagues that play just once a week.
This is the default option and most popular option for clubs.
Multiple times a week
When a league plays on multiple days of the week, this option allows for multiple dates on the first week to be selected.
This option does not support selecting multiple dates that span more than 7 days. Beyond this you have to manually specify each date and session using the option below.
Custom dates & sessions
See the dedicated article here for this option: Custom dates & sessions