Access the HighLight or Lowlight tools by pressing and holding the [TOOLS] button (or [T] on the QWERTY keyboard) then select either [S8] for Highlight or [S9] for Lowlight (you may need to select <more> if Highlight and Lowlight are not visible):

There is a dedicated [HIGHLIGHT] key just above the [NEXT/PREV] key in the moving light cluster of keys just to the left of the encoders. Use with [SHIFT] for Lowlight. When Highlight/Lowlight is turned on, this key's Greed LED is illuminated. Although Highlight is a tool, if you use the dedicated key it will not change the current Tool.
These tools allows you identify selected fixtures for ease of positioning. When you use Highlight, all Gobo and Color attributes are taken to their highlight value (no gobo, no color) and the intensity is taken to full (Note: Lens attributes are not affected). This allows you to position the fixture easily while not destroying cue information to see it. The Attribute Grid will show the text "HL" in place of the value that would normally be going to the stage:

Although Highlight alters attributes, it does not mark these attributes as changed. If the values were changed before Highlight was turned on, you will see a red delta HL. If the values were at their default values are under the control of a cue or look, you will see a black HL. The only attributes you can control when Highlight is on is Position and Lens. When you toggle Highlight off, all other attributes will return to their previous value.
If you highlight conventional fixtures, their intensity it taken to full as well. Used in combination with the [NEXT]/[PREV] key, you can quickly find fixtures. Lights with scrollers on them will be temporarily forced to Open White (or the first color in the gel string).
LowLight takes the selected fixture to Full and all other fixtures in the current cue list to 20%. It does not affect any other attributes.
See Also:
Tools