That's actually the opposite of my problem. Even in landscape, windows end up way too tall to be useful.

In a traditional floating setup I would have multiple smaller overlapping windows wherever I want them.

Whereas with a tiled/scrolling layout, windows can end up way too big to be useful. It's fine on a laptop though.

I initially used Niri on a laptop and thought it seemed great. Then plugged in my large monitor and realised it was awful there!