This will cause all tenant charges to be posted to the tenant's account 10 days before their due date. If you do not want the software to do that, then you'll need to adjust this setting to your preference before adding any tenants and placing them into a property. Next to each setting is a blue question mark (?) help icon, if you hover your mouse over the question mark it will explain the setting in more detail.
Review All Program Defaults and Advanced Default Settings