I think the cause is with the Ratio, but I am not certain, this appeared on my project and I can't find a solution, So this is my last draw on this issue before trying to blend it in my game and try to adjust it from there.
Whenever Maximize On Play is On, The ratio or camera tends to zoom or pan on the left side, I ignored this thinking it was an issue with my side but by building the pre-alpha on my game it became an annoying issue
Without Maximize
With Maximize
I don't see your code or the camera properties, But I'm pretty sure you could fix this using Cinemachine.
Check this tutorial by unity
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