The dining facilities can be set up in the rate plan settings:
Go to the "Rooms and rates" tab
Find the rate plan that's liable to change in the list (for your convenience you can use the search line or the "Group by" feature)
Click the three dots symbol at the line of the rate plan and choose the Edit rate option from the drop-down menu
If the dining facilities are unavailable, please leave the “Meals” checkbox empty
Otherwise, tick the “Meals” checkbox
Select the dining options from the appearing list