Radial filter messed up in Lightroom (user error, I'm sure)

I'm not sure what I've done recently but my radial filter effect settings are on dodge/burn for some reason. I'm just trying to add a vignette to highlight the iquana. When adding a radial filter, a red mask is shown & my changes are only visible in the thumbnails and not in the image I'm working on directly. What's going on? Thanks.

There's a dropdown at the top of all the sliders where it says Dodge | Burn -- click that and there should be an option to reset defaults.

Pressing the "O" key toggles the red mask on and off.

john crossley wrote in post #18014835
Pressing the "O" key toggles the red mask on and off.

+1. And double-clicking on "Effect" resets all settings to 0.

Thank you. I must have inadvertently pushed the O button at some time. Pressing O returned it to normal.

While we're on the subject:

Shift+O changes the color of the mask, you can cycle through red, green, white. I usually leave mine on green since most of my adjustments are on skin, and I need something that contrasts heavily with that.

If your toolbar is visible (tap T to toggle it on and off), you'll see a checkbox below the images that says "Show selected mask overlay."