How do I install the optional cover plate on the Honeywell T6 Pro?
Separate the Cover Plate from Mounting Plate. Mount the Mounting Plate to the wall using any of the 8 screw holes and insert and tighten mounting screws supplied with Cover Plate Kit. Snap the Cover Plate onto the Mounting Plate (Page 1).
From the official Honeywell T6 Pro manual, page 1
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