Welcome to the forum!!
Sure sounds like there should be a "closeout" piece of something there. My Coleman had flaps with Velcro that would fold over to hide these gaps. Can't imagine Jayco wouldn't do the same. Hopefully someone here will have an answer for you shortly. Hang in there!
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2013 Jayco Eagle 328 RLTS
2021 Keystone Montana 3121RL
2013 F350 6.7L 4x4 CCLB
W/Air Lift air bags (front & rear)
Equal-I-Zer™ WDH & B&W Companion
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