The side panel on Safari / Flying cloud was held in place.with 3 or 4 wire brads on my 2006. Just gently pry off using a putty knife or something similar. The panel is foam core so the brads should pull out of the front, and stay in the frame behind. When you are ready to reinstall, match the brads to the holes and thump in with your hand. Easy does it. Firm but no more, the panel is plastic.
PS - the plastic trim may have separated because it has shrunk a bit..
See if you can just push it back against the wall and hold it there with bits of double sided tape discreetly placed between the trim and the frame. The trim disguises a lot of flaws in cutting the panels. Erg! Quality Construction my foot.
Today is a gift, that's why they call it the present.