Use the flat end of a spudger to pry up and disconnect the display cable's press connector from the back of the screen.

Be careful not to damage the wide display flex ribbons on the bottom edge of the screen.

To re-attach press connectors like this one, carefully align and press down on one side until it clicks into place, then repeat on the other side. Do not press down on the middle. If the connector is misaligned, the pins can bend, causing permanent damage.