Superfluous tab in window

[Cop]

I installed new version AB. And now I see additional tab in every new opened window. As for me, it is very uncomfortable. The useful area of the screen decreases.

How to get rid of it?

[DutchGemini]

Maximise, it should go away. Had that too, was about to write a bug report -you could add tabs in this window- but then after maximising it went away. Did not have it anymore since.

[Cop]

Maximizing of window is uncomfortable. So, in inner (so to speak) window the combination Ctrl-W closes all opened tabs.
Also I like AB for possibility to use the different languages in address bar and page without language switching. This feature in new inner window doesn't work.
There are other bugs in new version AB also - white page after full-windowed video, content in new tab doesn't scaled... IMHO, this version is very crooked.

[x2088]

Maximizing gives you nothing... The last stable build is still 2017.9

[Dreamer]

Confirmed in AB 2018 build 7, FF engine, Windows 10. Here is just black and not on all tabs, sometimes it's 1 of 15 tabs, sometimes 0, but If I open another tab from the broken one, new tab is broken too.

[Cop]

Up theme. In newest version the situation the same.