[CaMo]

Hi there,

If you don't want to apply any of the other effects, you can click on the 'Reset to Original Image' preset on the right hand side. This will turn off all of the effects.
Then just open the Skin Smoothing controls and make the adjustments you want. There is even a slider for reducing thin wrinkles.

Workflow:

Open image > Mark-up > 'Reset To Original Image' > Skin Smoothing Controls.

OR

Open image > Mark-up > 'Reset To Original Image' > 'Remove Wrinkles' Preset.