I realize I did not mention it, but yes: the templates are AI-generated! There are filters for orientations, but I admit the aspect ratio can be a bit random.
Ah I've just found the filters, that's helpful. It's definitely not where I'd expect them to be; top right is where I'd expect sign in etc to live. They might be more discoverable with a text label right above the grid of templates, so they're in close proximity to the thing they're filtering.
I gather you are on mobile, this is helpful feedback, thank you!