If you want to dot the pattern, click the tone icon in the layer property palette.
If you want the pattern to be transparent, such as whitewashed, select use brightness of image under concentration. [PRO/EX]

If you want to adjust the tone concentration, adjust the opacity of the layer in the Layers palette.

※ In the sample image, I use the screen of the CLIP STUDIO PAINT Ver.1.8.8.



※作例内では、CLIP STUDIO PAINT Ver.1.8.8の画面を使用しています。