Important Microsoft no longer recommends creating and using Access web apps in SharePoint. As an alternative, consider using Microsoft Power Apps to build no-code business solutions for the web and mobile devices.
You can add custom action buttons to the Action Bar in Access web apps to control different tasks. For example, you might want to create a custom action button to hide or show different controls on a view or run a macro to perform various tasks.
This article doesn't apply to Access desktop databases. For information concerning forms and navigation in desktop databases, see create an Access form.