The User Editor setting allows you to enable or disable the editor minimap. The minimap is visible on the right-hand side of your script. When you write a script, the minimap can be useful for navigating, and understanding, large areas of code. The minimap is enabled by default, however you may wish to disable this feature if you don't find it useful.
How to enable/disable
Making a change to User Editor Settings only impacts the current user. Each user can have their own preference.
From ScriptRunner, select Settings.
Under User Settings, toggle the Show Editor Minimap option on or off.