How do I turn off the Operation Time Out setting that returns the LCD screen to the home screen after inactivity?

Press the home button and select Settings > General Settings > Basic Settings. Scroll down and set Operation Time Out to Off. This feature is enabled by default but can be disabled using this setting. (Page 24)

From the official Epson EcoTank ET-3850U All-in-One Wireless Printer manual, page 24

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