Border

Common Border Settings.

Pencil Border Settings

If you want to set your own color, uncheck the "Auto Color" option

Afterward, click on the color cube to choose a color

In the opened window, select your desired color

Using the chance of a border.

For example:

At 100% certainty The result:

50% probability The result:

At 0% The result:

If you want to disable the border for a pixel when drawing, select the pencil tool and uncheck the "Border" option ->