You cannot add the sidebar to a page.
Sidebar display settings
You can disable the display of the sidebar on app forms. To do that, open the interface designer and click an area on the modeling canvas that is empty of widgets.
In the right corner, the heading of the Modal window widget will appear. Click the gear icon next to it. In the window that opens, uncheck the Show sidebar box.
Moreover, you can link the visibility settings of the sidebar with a context variable. In this case, the sidebar will only be shown when the variable has a certain value. To create a link, click the icon and select a variable from the context. Read more in System widget settings.
To finish, click Save.
In this example, the sidebar shows the following widgets: App item status, Associated tasks, and Object activity stream. They allow important information about the app item to be shown directly on its page.
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