Switch view option disappeared from the composition panel
In the composition panel I cannot find the option to select and switch views any more.
Thank you for filing this request.
As of After Effects 18.0, the Composition panel toolbar has been streamlined. 3D-related controls now only appear in the toolbar when at least one 3D layer is present in the comp. More detail here:
Regarding the view layout controls, you can also access these controls by going to the View menu > Switch View Layout or Switch 3D View.