The ChangeWebMap Widget for ArcGIS Web AppBuilder allows users to switch the map content to another web map.
Using the Widget
The ChangeWebMap Widget is an in-panel widget that will be displayed in the toolbar of your WebApp Builder application. Click the icon display the Change Web Map panel.
Public Content Tab
The Public Content tab lists the web maps that are accessible to every one. When configuring the ChangeWebMap widget, the site administrator can filter the list of available web maps to a particular group or type.
My Content Tab
The My Content tab lists the web maps that are accessible to the current user. The first time the tab is displayed, you will need to sign into your Portal account.