Unable to turn off Visualize Spots feature in Healing.

[leonm30852257]

I must have accidentally hit a shortcut which turned on the Visualize Spots feature and now I cannot turn it off and cannot remove spots like before. In Lightroom my friends have shown me a simple check box that'll allow me to turn it off but I don't see that option in Classic. 

Is there a dropdown menu or a shortcut that'll allow me to turn off Visualize Spots?

[Rikk Flohr: Photography]

Hit [ T ] to reveal the Tool Bar where the control resides.

[Per Berntsen]

You can also press A to toggle Visualize spots on/off. This works even if the toolbar is not showing.