Choose between Pen (opaque), Highlighter Paper (multiply), and Highlighter Screen (semi-transparent).
Fill the existing selection (if available) with the chosen color or switch to the brush and the selected color. The brush size will be set according to the brush size in the settings under #3.
If you hold down the Shift key, the selection (if available) will be deselected after applying.
If you hold down the Alt/Option key when a selection is active, it will be changed to a border and filled. The border will be set to the brush size configured in the settings under #3.
If you hold down both the Alt/Option key and the Shift key when a selection is active, it will be changed to a border, filled, and the selection will be deselected.
If you hold down the Ctrl/Command key, the color picker will open, allowing you to change/save the selected color.
Right-clicking on the buttons will show you all available functions, so you don't have to remember the keyboard shortcuts.
Opens the settings, where you can adjust the brush size from 0.125% to 2% of the document width + document height / 2.
If you hold down the Alt/Option key, all layers created by the plugin will be deleted.
If you hold down the Ctrl/Command key, all colors will be restored.