The Wyze app does not support landscape more EXCEPT when actively viewing one or more camera videos.
You can group cameras or sensors together: https://support.wyzecam.com/hc/en-us/articles/360026255671&?section=sense-groups.
When you are viewing a grouped stack of cameras together in portrait mode, when you flip the phone to landscape, the view will change to a 2x2 grid.
Make sure your phone’s orientation lock is not engaged.
Finally, you can vote for full landscape support here: Landscape View For Tablets. Be sure to click the VOTE button at the top.