When you don't put the TV on they do learn to amuse themselves.
Cocomelon is absolute brain rot. Most of the shows on cbeebies are decent (Bing can go to hell though).
My favourites that the kids love/loved too are
Prime video: Kipper, Tumbleleaf, Tractor Ted, Button Moon
BBC: Clangers, Twirlywoos, Justin's House, Baby Club, Bluey, Postman Pat, Bob the Builder, the old Fireman Sam
Netflix: GIant Jack, The adventures of Paddington
I just try and avoid fast paced, bright coloured CGI with silly voices and too many sound effects.
I want there to be a story arc or simple learning concepts like Twirlywoos.