<blockquote>
<p>The thing on the right of the line number pane where the "-" signs are?</p>
</blockquote>
<p>Yes, the one where you click to open/close <a href="https://www.geany.org/manual/current/index.html#folding" rel="nofollow">folding</a>.  I presume thats what the OP meant.</p>
<blockquote>
<p>I did try finding the answer on my own first, btw</p>
</blockquote>
<p>No problem, only comment on your experiment is to maybe only fiddle with things in the Scintilla API, since thats all you will be able to change in the final product, not internals of Scintilla :).</p>
<p>The Scintilla margin API is <a href="https://www.scintilla.org/ScintillaDoc.html#Margins" rel="nofollow">here</a></p>
<p>And its set in Geany <a href="https://github.com/geany/geany/blob/770cda40646e8ebfe6591df03356e2bcb71b875c/src/sciwrappers.c#L164">here</a> (HINT: found by getting Geany to "find in files" for SCI_MARGIN which is shown in the Scintilla API) but notice that the width is hard coded 12 to show it and 0 to hide it.   So what you need to do is to have a setting that changes the hard coded 12 to a setting value.</p>

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