Where is the reset button for Exporer Mode?

I know there used to be one. I'm not sure why they got rid of it?  Anyway, how do I reset it?

Hi John! I am assuming this is a Jumpgate game. If this is not the case, let me know and I will amend my answer. Explorer Mode is in the Dynamic Lighting Tool. Most of the DL tools can be found there, which allows you better real-time control that the Page Tool modal dialog. Scroll down to where the Explorer Mode toggle is and click either Edit Explored Areas to call up the tools, or in your case the Reset Button.

Thanks. I was looking in the page settings for the map itself.