I’m not sure what I did. Maybe be I accidentally hit a key to cause this but now my PCB looks blue in the pcb editor. Also the 3d looks brown rather than it’s usual green. I’m not sure if I somehow removed the solder mask layer?
You added a Filled Zone on B-Cut.
ah yes, thank you. Not sure how I did that but I got rid of it now. 
In addition:
There is no need to draw a complicated zone edge, as the zone algorithm can keep a clearance from the edge of the PCB just as easily as it can from copper items in other nets. You can set this clearance in: PCB Editor / File / Board Setup / Design Rules / Constraints / Copper / Copper to edge clearance
I often draw zone boundaries as a rough pentagon around the PCB. This way it is very obvious (for example in gerber files) if anything goes wrong with zone fills.
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