How change brightness/intensity of local adjustment mask overlay

"Do your brushing so that it looks good to you, temporarily set the flow and density to 100 so you can see the overlay, then set the flow and density back to whatever you had it at."

Unfortunately, the highlighting is based on the flow and density of the stroke at the time it was applied.  Changing the flow and density after the stroke is applied doesn't affect that stroke and thus doesn't affect the color of the overlay.

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Flow...  Big dummy!

BUT, I've still got the same problem...  If I have the Density and Flow at 100 I can see the overly.  But frequently, that's NOT how I'm using the adjustment brush.  Sometimes I WANT it with a density of 50% to limit the effect of the adjustment, or I want a flow of 25% so it builds up gradually...  In either case, even with the flow as high as 60%, the overlay mask is essentially invisible. 

Unfortunately, it sounds like there's no way to make the mask more visible, and I haven't found a way to change either flow or density on a stroke I've made.

"Sounds like your brush has flow or density (or both) set close to zero."

This is more likely than a buggy GPU driver.

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A couple more thoughts:

1. Temporarily disable LR's use of the GPU by setting Preferences > Performace > Use Graphics Processor to Off. In the past, there have been a few instances where bugs in GPU drivers have caused overlays to appear differently.

2. Post a full-resolution screenshot of the Develop window showing the overlay with some local-adjustment brush strokes. That will let us see if you're system is showing the overlay differently than normal.

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Unfortunately, the intensity of the overlay mask is not controlable.

The best we can offer is a color change. I went with green since that is less common of a color in my non-landscape photos.

Try a  different color

Shift O

https://blogs.adobe.com/jkost/2014/01/the-adjustment-brush-overlay-in-lightroom.html