Hi ,
Actually you cannot change the moonlight directly from the property editor. In the main blueprint , you will see a comment section called as Set Moon Parameters , or you can directly find references of Moonlight variable to get to the exact location where you are supposed to make changes. See the below pic :
Here you can see that the moon intensity is calculated by multiplying moon phase with a value 0f 0.05. You can change the value to , say 4 or 5 to get brighter nights, but if moon phase is nearly equal to zero , this won’t be of significance , so you may want to clamp the result , to , say from 3 to 6 , or you can add a base minimum with this multiplication.
Also , you will notice that in the variable array called ColorGradingTexturesLookUp, the ambient cubemap intensity is given as 0.02 , you can create a for loop iteration and set the night time skylight intensity , to say 3 or 4, as shown below
Kindly let me know if you face further issues.