Now the settings for drawing lineart.

I've selected the hard round brush (5 pixels), found where the initial brush is.

Check "Opacity" in the tablet options.

Brush: initial brush

Select options to control tablet pressure:

Show help for this feature: brush tablet options

size

opacity

color brush

mode

regular

size

opacity

perfect circle

In brush options, move the "interval"bar all the way to the left.

fade

color jitter

scatter

scatter

keep these settings for all brushes

interval

firmness

angle

perfect circle