How Actions Are Ordered in the Salesforce1 Action Bar

The Salesforce1 and Lightning Experience Actions section of a page layout and global publisher layout drives which actions appear in the Salesforce1 action bar. It also enables you to customize the order of quick actions, productivity actions, and standard and custom buttons that are available as actions.
Available in: both Salesforce Classic and Lightning Experience
Available in: Group, Professional, Enterprise, Performance, Unlimited, Contact Manager, Database.com, and Developer Editions

If you customize the Salesforce1 and Lightning Experience Actions section of a layout, Salesforce1 reflects your customizations.

If you customize the actions in the Quick Actions in the Salesforce Classic Publisher section, but don’t customize the action bar section, the Salesforce1 action bar inherits its quick actions from the Quick Actions in the Salesforce Classic Publisher section.

If neither section is customized, the action bar inherits a default set of actions predefined by Salesforce. The sets of actions differ between objects, based on the most common or typical activities required for each object.