I wonder if where that circle cut-out is allows you to see the pilot. I haven't any experience with that particular unit. If it works like most gas valves, when you turn the dial to Pilot, you push in and hold the dial while clicking the starter to ignite the pilot light. Keep holding in the dial for 30 seconds (or longer). When you release the dial and the pilot stays lit, turn the dial to On.
If trying to ignite the pilot and after 30 seconds (or longer) it doesn't want to stay lit, then the thermocouple may be bad and either need cleaning or replaced.
Also, the igniter might not work either. They tend to fail often. Maybe that circle hole is so you can manually light the pilot?
Beyond that, it probably exceeds my knowledge.
John & Jennifer and family
2018 Jayco White Hawk 31BH 34'
2004 Surveyor by Forest River 29'
1996 Coachman Catalina 25'
2002 Jayco 12UTD PopUp