I am afraid that there is no such setting that you can switch to turn on/off the functionality based on the screen orientation. And as I said in my previous response this is unsupported functionality and the posted solution is a workaround not an official support suggestion - and yes it requires some custom CSS rules. I am afraid that currently there is no other solution. You can submit this as a feature request on UserVoice, so we can consider it for a future implementation.
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