Parameter General for Aquamail
If you uncheck "Vérification courrier planifié" Aquamail must stop to sync, so never sync for all.
Parameter for each of your account
If you uncheck "Vérification courrier planifié" Aquamail must allways stop sync for this account.
If checked, Aquamail sync this account if general option for sync is checked. If general option is unchecked none account must be synched this and other, even if "Vérification courrier planifié" is checked on this account. General option must have higher priority.
Parameter specific for each of your account if you want different cheking time.
So if I uncheck option on first picture and checked on second picture, the account for second picture is checked.
If I want unable all account checking I must disabled "verification planified" in all account and enable it if I want anew sync this account.
The general parameter should stop synchronization of full Aquamail.