Carry over left over meals from previous open day (Headcount Only)
This is a checkbox at the site-level under Site Details in the section "Attendance & Meal Count Settings".
Only Sponsor Admin users can edit this checkbox.

Sites doing headcount meal counts that select this option will automatically carryover leftovers from the prior day on which the site was open.

Note that the site needs to be set to headcount meal counts and the checkbox in Site Details called "Display all Options on Meal Count Screen" needs to be checked for this to function properly.