• The structure of a user interface in your app, such as an activity, is defined by a layout. A hierarchy of View and View Group objects is used to create all of the layout's elements. A View depicts something that the user can see and interact with.
• To do so, go to View > Tool Windows > Project, or just click Project on the Android Studio screen's left side. Click the Design tab at the top right of the window if your editor displays the XML source. Select Blueprint under (Select Design Surface).
• 'Invalidate caches & restart' might help.
• Select this option to restart Android Studio. It might take a while. If that doesn't work, try rebuilding your project.

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