When you are curious about the Scope Box usage in your project, start the Application. The icon should be available on the Add-ins ribbon.

You will be presented with a list of Scope Boxes, green for used ones, red for unused ones, and grey for Scope Boxes which can't be deleted because they are pinned grouped, or used by another user.
Just Click Delete Unused to delete all unused Scope Boxes - those which are not used by any views, levels, grids, or reference planes.

If you would like to select exactly which Scope Boxes to delete instead of all unused you may also check the box before each Scope Box and use the Delete Checked button.
However, be careful - because this button will also allow you to delete green Scope Boxes, that is - Scope Boxes that are in use in your project. The idea of this is to enable you to delete all Scope Boxes in a project.

To find out where a Scope Box is used, just double-click it and you will be presented with a list of views, levels, grids, or reference planes that are set to follow that Scope Box.

From there you can also double-click a View to make it the active view in your Revit window.

The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin.

To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 7/8.1/10/11) and uninstall as you would any other application from your system.

Please ensure that you have installed .Net 4.6 (or newer) prior to running the command.