Single Panel lobby browser but Two panel when inside lobby

[jauggy]

With the lobby titles getting longer, it would be useful to have a mode where it can be single panel in lobby list browser but two panel when in the lobby.

See previous discord discussion here: https://ptb.discord.com/channels/549281623154229250/549282587487502347/1256524617905078353

Alternatively to conserve space, allow the map name column to take up less space.