As users have become accustomed in many applications, top menus with context sensitive sub-menus are the norm, but are not part of the standard Power Apps “suite”, so creating this type of function is a good enhancement to user experience using a “look and feel” familiar to them.
This blog will demonstrate one method of achieving this functionality with an experience familiar to the user.
Office 365Groups have many uses, particularly when Security Enabled for controlling user authorities to access individual Power Apps while also allowing the same group to control access to the data source ("all in one place").
However you can also use the user’s membership of any group (not necessarily having access to the app and not needing security enablement) to control what they can do and see once the app is opened. This blog discusses the options for enabling the functionality.