The vertical column that contains the code line number is VSC is too wide. Is there a way to narrow it down?
If you create a font specifically for it I suspect that either filling the font bounds more and then setting it as the pref font, then adjusting zoom in/out. Depending on the graphics output preprocessing sometimes that scales the display that vsCode is rendering from its software. If it is in fact the case that maybe you're zoomed in too much to a small font, it might look different for you than anyone else. It may help to change try installing vscode in a vm to see if defaults look the same. Maybe it's a setting or extension causing a graphical artifact on your machine.