Epson Pro L30002UNL 30,000-Lumen HDR Pixel-Shift DCI 4K Laser 3LCD Large Venue Projector (White) - Manual (Page 216)

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You see a screen with boundary lines indicating areas that are overlapping. The boundary lines are
based on the
Top Edge , Bottom Edge , Right Edge , and Left Edge settings you selected for the
Edge Blending setting.
13. Use the arrow buttons to select a boundary line of the area you want to adjust and press Enter .
The selected line is displayed in orange.
14. Use the arrow buttons to adjust the boundary line position and press Enter .
15. Use the arrow buttons to select an adjustment point and press Enter .
The selected point turns orange.