Apologies if this has been reported already, I'm not seeing any search results but it's hard to search for. This actually started a few versions back but it remains in the latest/current version as well. Whenever an options list is presented it's horizontal, sometimes comically so. A screenshot tells the story, in this case clicking the "More..." button on a recorded show (running Sonoma 14.2.1):
The Channels app you are using is actually the iPad version. Since it tends to work pretty well, the developers have allowed the app to be installed on macOS if your Mac has an Apple silicon chip (M1, etc.).
I believe previous statements have been made that ensuring the app works without modification on macOS is not a priority.
Yes I understand that, but they've been receptive to issues in the past (like spaces support, etc.) I know it's not officially supported but I'm just passing it along in case it's something obvious and easy to fix.
This is how Apple has chosen to implement things in their iPad emulator