Hi, For some reason the sign "Show Edit Pins and the check box for show selected Mask Overlay" has disappeared from the bottom of the LR screen. I have Mac OS X and LR cc.
Press T to show (and hide) the toolbar.
The only time you get those option is if you have one of the tools at the top selected.
Like if you used the Adjustment Brush and had several adjustment areas the only time the pins show and the mask overlay option shows is if you again select the Adjustment Brush.
Once you close those tools those options are no longer displayed.
Thanks. It worked.