Refitting

lift the door panel upwards, to gain access to the safety closure knob, then extract it;

remove the protective door cover.

Carefully remove the cover taking care not to damage it; then place it where it will be protected from dust so as not to damage the adhesive on the edges.
When refitting take care to ensure that the adhesive edge sticks to the door frame; if the adhesive is no longer working properly, then the cover has to be replaced.

Refitting

When refitting, simply reverse the order of the operations carried out for the removal.