When working on your stage, you may want to simulate the light emitted by your various devices such as video projectors and led screens. To do so, you can use the stage rendering options.
You can choose a Rendering mode in the list:
Preview : a digital preview that doesn't take into account the light from projectors or LED screens
Simulation : aims to simulate reality by taking into account the light from projectors and LED screens
Illumination : represents the illumination in a gradient of colours from blue to red: