Map Layers Stuck Transparent

[S_Trick]

One of my coworkers and I have been working on a series of maps. I'm unsure what happened, but now a few of our projects have layers that are semi-transparent despite attempts to change the symbology. When selecting a color in the symbology tab they're all set to 0% transparency but once applied to the map it's still transparent. 

Increasing the transparency in symbology just serves to make the layers even paler. Copying the layer didn't solve the problem , but new layers added don't have the transparency problem. 

Is there some other feature in GIS Pro we may have activated that would affect these layers?

[KenBuja · Accepted solution]

Have you checked the Effects section on the Feature Layer tab to see if the Transparency was changed or any Layer/Feature Blending was applied?

 

[S_Trick]

That was it! Thank you so much!

[JohnWatt]

If color and layer both have no transparency, check 'vary symbology by attribute' - eg below. Also check transparency set against any containing groups in the TOC, or a transparent layer sitting on top?