The opening hours you display on your club information page is not the same as the actual hours that are bookable in the schedule.
Changing the visible opening hours on your club information page
(Only to let the player know in terms of the club information page):
Go to Settings -> The club -> See Opening Hours
Changing the bookable hours in your schedule (just one or a few days)
To change your opening ir closing time just for one or several random days, the easiest method is to simply create an "Unavaliable" booking during those hours in the schedule. Highlight the times and courts you want to be closed -> Select Unavailable -> Write a note if needed -> Save.
Changing the bookable hours in your schedule (long term)
The hours that are visible to book in your club's schedule is tied to the club's price list. The price list hours decides what hours player can book and not book. The system rule is: If there is a price for a certain court and time = it means it is bookable.
To change your bookable hours, navigate to Settings -> Price list -> Standard price list -> Select price list -> Click on the 3 dots on your pricing variable -> Adjust the hours available inside of that price variant.