Instructions for anyone lazy:

• Drag down your quick settings and long-press the Smart View tile.

• Tap on the three-dot icon in the top right and open settings.

• At the bottom of the screen, open the about Smart View menu.

• Rapidly tap on the part of the screen that says Smart View 10 times.

• When prompted, enter the password: #00rtsp00

• When the developer options menu opens, enable the Google Cast toggle.