I don't know the nomenclature, but on the left of my main Logos window there is a control bar with "Dashboard", "Library", "Search", etc. At the bottom is an arrow that lets you tuck it out of the way or display it. see image. The "tuck-fold" arrow is circled.
suggestion : put a similar arrow on the bottom of the Favorites-Highlight panel so it also can be toggled between displayed or folded out of the way. I like it available but there is a limit to how narrow I can make it. I'd like to reclaim some screen real estate for most of what I do.
