How to make "grep-mode" open a single vertical split for showing results?

[doltes]

Two months ago I created
[[https://emacs.stackexchange.com/questions/61759][a question]] in
Emacs Stack Exchange and I didn't get any significant help. So far, I
haven't solved this question, so I'm asking here with the hope that
someone might help me with this.

Basically, what I'm trying to accomplish is to make =grep-mode= show
all ocurrences in the same vertical split. In other words, I only want
it to open a single vertical split. By default, I use a very
minimalistic font: =Misc Fixed:pixelsize=7=. In the gif shown below,
you can see that when using this font, 7 splits are opened which is
overwhelming and distracting.

Note that I can accomplish what I'm requesting if I use a very big
font (e.g. =Iosevka SS04 Light 20=) (see gif below). However, I would
like to have the same behavior with the font I like to use, =Misc
Fixed:pixelsize=7=.

-- 
Greetings,
doltes.