https://faq.i3wm.org/questions/Frequently asked questions and answers about the i3 window managerenCopyright i3, 2012Mon, 30 Dec 2013 21:05:38 +0000https://faq.i3wm.org/question/3134/why-is-there-a-red-line-on-the-right-side-of-the-screen/Please see the screenshot below: http://imgur.com/D3p9GDt When there are two windows side by side, this red line disappears.Mon, 30 Dec 2013 20:13:01 +0000https://faq.i3wm.org/question/3134/why-is-there-a-red-line-on-the-right-side-of-the-screen/https://faq.i3wm.org/question/3134/why-is-there-a-red-line-on-the-right-side-of-the-screen/?answer=3135#post-id-3135It does not have an own paragraph in the userguide, but in the [colors section](http://i3wm.org/docs/userguide.html#_changing_colors) you can read about the _indicator_. > The **indicator** color is used for > indicating where a new window will be > opened. For horizontal split > containers, the right border will be > painted in indicator color, for > vertical split containers, the bottom > border. This only applies to single > windows within a split container, > which are otherwise indistinguishable > from single windows outside of a split > container.Mon, 30 Dec 2013 21:05:38 +0000https://faq.i3wm.org/question/3134/why-is-there-a-red-line-on-the-right-side-of-the-screen/?answer=3135#post-id-3135