Thanks so much! Sure enough the video showed that the entire outer trim needs to be removed in order to get the screen out. Well, we simply reoriented our thinking to "leave things alone"
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With all the Covid-19 plexi-glass barriers being used by businesses, the local glass installers had a scrap lying around that was just what we needed. It's held in place with two strips of velcro and there is room to lay some bubble wrap between the plexiglass and the screen. Hope I can add photos here. We think this fix will help when we visit our daughter in Vermont before the warmer weather.