With Mini-schnauzers being way too curious, I opted to get some quality foam core poster board at Staples. I cut it to fit inside of the screen inlay opening, and used clear scotch tape to mount it in the corners. This way I can remove it at will, with no left overs.
An added advantage is that it acts as a "cold air dam" when the a/c is on, and the camper door is open while transferring stuff thru the screen door access slider, for breakfast, lunch, or dinner under the clear blue sky.
Steve & Jan, Ava & Emma (Mini Schnauzers):
2016 F350 Lariat 4X4 Powerstroke CC/SB "PULLTOY V"
2013 Alpine 3535RE "MAGIC CARPET IV"
Proud Navy Vet!