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Is there a way to unreveal bits of the map when using dynamic lighting?

Hey guys. I was just testing out a new map, but I've accidentally revealed a segment that I didn't intend to, due to a crack in the lines I'd set down for the dynamic lighting. Is there any way to re-hide, or reset the map so that everything is hidden again, or would I need to redo the map from scratch?
Just go to the dynamic lighting layer and re draw a line segment to block out that section again, always a good idea to skim your map with a token that has sight to check for holes or cracks that are not intended. For doors and stuff I personally make those segments a larger size and different color so i can identify and "open" them. Hope this helps.
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Edited 1550673592
Also, if you want advanced fog of war reset so the player can no longer see the accidentally revealed map portion, click the fog of war tool and then the reset fog drop down option after you fix the lighting lines issue.
I knew there'd be an easy button for it somewhere that I was missing, thanks!   And yeah, I've learned to do the door thing. I think this crack was caused by where the beginning and the end of the box I was drawing didn't line up quite fully. Which is weird as I was holding down the shift key, but oh well.