[B4] Messages - Inbox taking too much space on small screens (not tablet/phone)

Hi,

I have a couple of users that uses pcs with small screens, where some pages such as the Messages get a little bit difficult to work with on the theme with side panel turned on.

On my end I will most likely add a 'classic' theme to allow users to select the best theam for them, but I still think that there might be something that can be done here, for instance, give more space for the conversation column (by reducing the inbox) or even make it a single column for this kind of screen resolution.

Thanks