@Nikola ,
if the border was only white not gray
Settings > Style Configurator > Language: Global Styles > Style: Fold Margin, change the Background Colour to white (or whatever non-gray color you prefer)
I wanted to try the trick with Pyton Script plugin but I would need step by step instructions
Plugins > Plugins Admin: in the
Available tab, enable ☑ Python Script and
Install. Notepad++ should restart after installing the plugin
Plugins > Python Script > Scripts: in the resulting sub-menu, Ctrl+Click on the Startup (user)
(if you normal-click, it will run the script; ctrl+click will edit the script – you want to edit it)
It will open a file in Notepad++. At the end of that file, add the lineseditor1.setMarginLeft(30)
editor2.setMarginLeft(30)
and save that file.
Plugins > Python Script > Configuration…. Change the
Initialisation: drop-down to ATSTARTUP, and click
OK
Exit and restart Notepad++.
This should set wider margins. If it’s too wide or too narrow, use a smaller or larger number than 30 (bigger number means wider)
If it doesn’t work for you, show us your ? > Debug Info, and give us screenshots showing your edited startup.py open in Notepad++, and maybe with the Plugins > Python Script > Show Console showing, so we can see if there are any unexpected error messages