Just some thoughts:
the x to close the resource window tabs should be on the tab like in a browser. Otherwise, you have to move your cursor back and forth to position and close tabs. It's not intuitive and not efficient.
Also, the method for positioning your layout is painful. I finally added a shortcut to the maximize layout to my toolbar. This gave me a maximize button that helped. However, I 100% preferred previous iterations of Logos's layout scheme in this regard. It was easier. Just normal windows that we are used to already. We don't have to reinvent the wheel here. Just IMO.
The back button and forward button would be better IMO closer to the rest of the buttons on the resource toolbar. For example, if you have a window open fullscreen, I don't like having to go all the way over "there" to hit back. I would prefer it where everything else is. At least, you could allow the buttons to be moved around so we could decide.
Logos 4 has great potential, and it's already a great piece of software. These things IMO detract a little, but they can easily be fixed. Thanks Logos for all your hard work.