Size between code and line number too long

Hello following picture showing problem

How i reduce this size?

Can you reproduce the problem in Safe Mode? To launch Safe Mode:

  1. Completely exit all instances of Atom
  2. Launch Atom with the command atom --safe

If this is one of the standard themes, I suspect it won’t reproduce. You can possibly update it using some CSS in your styles.less or you can file an Issue on the theme or package causing the problem.