The bookmarks panel on the left was not shrinkable more than the width of the associated toolbar, and the main toolbars took too much space on some platforms.
In this version the bookmarks toolbar is positioned vertically next to the bookmarks container that is now free to shrink without problems.
There is also a "Toolbars Manager" accessible from the Options panel in the Tool menu, or right clicking on a free spot of one of the toolbars, from there you can choose which toolbars you want to visualize in the user interface (default setting is to show all toolbars).
Best regards.
