Allow disabling of auto-collapsing sidebar

While organizing photos into albums, it's exhausting to constantly have to re-open (by hand or with the P shortcut) the sidebar because Lightroom decides (for me) that it's taking too much real estate on the screen.

Please add a configuration setting to disable this disruptive behavior which may be a good default to unclutter the experience of most users, but becomes quite annoying when doing organization work. 

Thanks.