Why don't my customizations of the frame parameters work?
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This probably happens because you have set the frame parameters in
the variable `initial-frame-alist'. That variable holds parameters
used only for the first frame created when Emacs starts. To customize
the parameters of all frames, change the variable `default-frame-alist'
instead.
These two variables exist because many users customize the initial
frame in a special way. For example, you could determine the position
and size of the initial frame, but would like to control the geometry
of the other frames by individually positioning each one of them.