Double Border Installation of automation tools will be more detailed below. Double borders are used to give more visibility to the text for the viewer. It’s only used if: The border color is too light. If it’s yellow , always use Double Border. The margin of the subtitles already has text behind it. The margins of the subtitles are noisy and hard to see without it. This is the settings used for adding double border: You can check “save configuration” to save this configuration. Shadow Indention can be used as a substitute or in addition.