u50623- LingQ looked like that for me too, until I used my browser’s zoom option, and now it fills the width of the page, and everything is bigger.
I know Ctrl/Cmd + … it enlarges everything, but the dictionnary subframe width will not be larger.
“but the dictionnary subframe width will not be larger.”
I see what you mean. The problem is that you can’t see the entire dictionary page within the dictionary subframe, which is annoying because you then have to scroll up, down, left, and right within the dictionary subframe to see the definition. Enlarging everything with Ctrl/Cmd + enlarges the dictionary subframe, but also enlarges the dictionary page within the subframe, so you cannot see any more of the dictionary page by doing so, and therefore this does nothing to solve your third problem.