From SmashWiki, the Super Smash Bros. wiki
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In Super Smash Bros. Ultimate
In Ultimate, the player can create different brightness settings for whether the Nintendo Switch is in TV-Mode or Handheld-Mode, automatically changing if the system is docked or not. A slider can be found to adjust the brightness, at a default brightness of 50. A still image of Mario and Bowser fighting on Battlefield and a greyscale spectrum of the Super Smash Bros. logo is used to easily compare different brightness settings. Pressing X will reset the brightness slider to 50, and pressing Y will fullscreen the still image for a better comparison.