in the particular release topic is great. Hookmark 6 public beta 3 is now available and there is a topic for it
figuring out where/how to place this icon has been pretty hard for us. it’s changed several times over the years, but I think this is going to be its home for a while (having said that, it’s also available from the menu bar window and the Bookmarks window).
The title bar is mainly for contextual actions, whereas the gear button is general. (Exception is the Bookmarks window button).
It’s small because (a) the pane in which it is now placed is small; (b) the command there are secondary. We don’t want to distract new users from the main commands which are contextual. The Action ☰* button is where the main action is.