How can I turn on Cursor and Keyboard on my iPad to make Universal Control work?

I want to use Universal Control between an OSX Monterey 12.6 Mac and an iPadOS 15 iPad mini 4.

When I try to move my mouse icon from my Mac to the iPad the icon does not appear on the iPad screen.

I have enabled Handoff on the iPad as instructed by Apple's technical article Universal Control: Use a single keyboard and mouse between Mac and iPad - Apple Support

The technical article says to "Turn on Cursor" on the iPad. Where is that menu item?

Universal Control works between my Mac and another one (also OSX Monterey 12.6) on the same desk so the Mac side of things must be OK.

Thanks for any help.