Epson BrightLink 1485Fi 5000-Lumen Pixel-Shift Full HD Ultra-Short Throw 3LCD Interactive Laser Projector - Manual (Page 144)

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You see a screen like this:
8. Press Menu or Esc to exit the menus.
Parent topic: Using Basic Projector Features
Adjusting the Image Resolution
You can adjust the image resolution to project a clear image with an emphatic texture and material feel.
1. Turn on the projector and switch to the image source you want to use.
2. Press the Menu button.