"Additional Layout Options" window is not resizable
Gnome Tweaks 3.28.1-1.fc28.noarch.
Tweaks -> Keyboard & Mouse -> Additional Keyboard Options.
Many categories (e. g. "Caps Lock behavior", "Key to choose the 3rd level", "Ctrl position" to name a few) have too large number of options to fit the window, I have to scroll the list to observe options in such category. It is not convenient. I want to enlarge the window to see all options in the category, but "Additional Layout Options" window is not resizable.
It is stupid "Keyhole metaphor": I have large screen, but I have been forced to to see data through tiny fixed-size window.
BTW, when mouse pointer is over the window border, it changes its shape to give me a (false!) hint that the window is resizable, while actually it is not.