Adjustment Brush Issues

Consider: https://shootdotedit.com/2018/02/how-to-blur-background-in-lightroom/

note, I cannot find a link arguing to not use auto mask, but using the range mask instead can provide more control.

Ahh, this link about more control (range instead of auto) https://www.digitalphotographyformoms.com/lightroom-range-mask-selections-now-more-accurate/

I agree with answers given above!

Your brush settings are 'all over the place' - really mixed and meaningless.

Start with a fresh brush by resetting-

Double-click on the word "Effect:" to set all sliders back to defaults, then use one or two sliders for the effect you want.

Note also that a Brush COLOR will only tint where you paint, AND only add a tint where tones exist (not on white areas)

A couple of things.

1. As stated by JohanElzenga, sliding Saturation down to -100 will take all color out.

2. Looks like your adjustments in the brush took a previous setting as current default, so many sliders moved around. Just go and reset them all to 0.

3. Now, I would actually recommend that you do not have the Auto Mask turned on for this sort of adjustment. Go and delete the brush and start over, this time without Auto Mask. And before you make any adjustments, go and click on the Range Mask, select color, use the then available selector tool (eyedropper) to select color(s) to include in mask. Show the overlay to see what’s included, adjust as required.

4. For a blur, start with just Sharpness, perhaps as much as -100.

The Color box is set to no coloring (white with a cross through it). Whites is set to +74 however (and I can’t see Exposure) so that is probably the culprit. And Saturation is set to -100, so this removes all color.