What Are the Red Green Bars on effects in xLights

While working on importing the 2020 xLights around the world sequence “Into the Unknown” we noticed the red and green bars on some effects in the sequence. They look like this: showing effects in xlights with red and green fade bars

After some prodding we discovered the red line means transition out, whereas the green line indicates a transition in.

To create or edit a transition the controls on the Layer Blending menu.

Here is a sample effect with a fade transition in: xlights transition fade in

Here is a sample effect with a fade transition out: xlights transition fade out