Mask outline Color

Processing
1

I notice that on two of my systems the mask outline colors are different. One system uses a black outline, the other red.
Not sure where or when the change was made. Can somebody point me to the source of the change … red is far easier to see.

2

There’s a “grid” icon at the bottom right of the darkroom view. Right-click it and select an overlay colour.

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3

Thanks … much better