How do I access the Installer Setup (ISU) to configure advanced settings?

Press and hold the CENTER and down arrow buttons for approximately 3 seconds to enter the advanced menu, then press Select to enter ISU. Use the arrow buttons to change values and press Select to confirm, or press Back to ignore changes. Press Home when finished to save your settings and return to the Home screen. (Page 8)

From the official Honeywell Home T6 Pro Th6320u2008 manual, page 8

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