The software say stand in the midle off your playspace and press Calibrate Center, when i stand in the midle i cant use a mouse so only thing i can do is put it on the ground in the midle but that is not what it show you should do.
Its the same, it just wants to know where you usually stand, its not worded correctly
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Ok you should not use it i now know, you lose steams chaparone with is bad 
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Do you have Lighthouses?
If no then just click through setup & manually enter height.
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It removes the chaperone from steam so dont want it.