Insert the pointed end of a spudger into the gap on the right side of the sensor bar between the rightmost screw hole and the adjacent screw hole.

Lift up the right side of the sensor bar to dislodge it from the frame.

You only need to lift the sensor bar so that it is loose in the frame. Don't try to remove the front sensor bar—it is still attached to the Surface by a cable that connects under the motherboard.