Thank you Oliver. Your advice has helped me.
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Desktop Bugs, which is subscribed to gnome-system-monitor in Ubuntu.
Window full-screen size when Firefox starts
Almost all applications (Firefox, Nautilus, Google Chrome, PyCharm,
Skype, Calendar and other) opens in maximized size if it window size was
larger than some value (more than about 80% of display width and height)
when application was closed.
Ubuntu 18.04, NVidia drivers,
Linux cykooz-pc 3.19.0-15-generic #15-Ubuntu SMP Thu Apr 16 23:32:37 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux
Hotkeys not functional in cyrillic keyboard for the PyCharm 4.0.6 +
Oracle Java 8 (from the webupd8team/java ppa)
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