Where are the Landscape sculpt brush flow settings?

I’m no longer able to use the landscape/terrain sculpting brushes (sculpt, flatten, smooth, etc.) as a continuous brush stroke. I can make single clicks to modify the terrain but any attempt to make a seamless brushstroke no longer works.

I’m guessing I accidentally hit some hotkey that disabled the default behavior but can’t seem to figure out what it was. Any ideas how to restore the default settings or adjust brush flow?