Please do let me know. I have asked it on Reddit thread ( [https://www.reddit.com/r/libreoffice/comments/auwvxa/is_there_us_a_way_to_have_complete_fullscreen_in/], nobody answered.
This is Ubuntu 18.10, with Libra Office Version: 6.1.4.2
There is a notch above, sideways etc all over the screen. So, If someone knows to hide it when its full-screen, let me know. (This is not even a proper definition of “Full-screen”