How do you filter free/included content with Apple TV+ subscription

I have a subscription for Apple TV+ and watch it on TV using a Roku Streaming Stick 4k.

How do you filter to show only free/included content?

And there only seems to be about 10 shows on the channel, listed again and again under different categories! It's nuts: once you've watched Ted Lasso and Severance, there's almost nothing else to watch - or am I missing something?

Compared to Netflix or Prime, it is utterly useless. And really hard to use: classic Apple...

... in fact, this is perfectly illustrated by me having to 'choose a topic' to post this - fair enough - but this page won't let me start typing A to find "Apple TV+" - you can't do it! You have a choose a topic from THEIR LIST - and of course "Apple TV+" is not a Topic, so I have to post it under Apple TV which I believe is something completely different...