The long edge of the heater block should point straight back towards the Z-Axis when installed (aligned with the exhaust opening for the constant-on fan).
The firmware counts on this orientation during auto levelling probe retract - if it's rotated out of alignment, it can bang into the edge of the glass while trying to retract the auto probe.
Once aligned, tighten down the screws on the top (until the two pieces of printed plastics are touching) to apply clamping force to the K-Head heat sink to lock it from rotating.
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