xCHM Debian stable package on my laptop has a display
which is too wide for the screen. Need an adjustable
width to avoid messy side-scrolling.
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I don't understand what you want. Please be more specific.
You can just keep the Alt key pressed while dragging the
window with the mouse until you can find a corner to resize
the window from. Then just close xCHM and next time you
start it it will use the new size.
This looks to me more like something you'd ask your
distribution maintainers than me.