If your strokes automatically turn into straight lines, it is likely caused by one of two settings.

Reason 1: Smoothing is at 100%

When the smoothing slider for a tool is set to 100%, every line you draw will be straightened.

1. Select the active tool on your Tool Wheel.
2. On the inner ring of the wheel, tap the smoothing value (the squiggly line icon with a percentage).
3. Move the slider to a lower value. A setting of 0-10% will give you a more natural, responsive stroke.

Reason 2: A Snap Option is Enabled

If a Snap option is active in the Precision menu, your strokes will automatically align to the grid or other guides.

1. Open the Precision menu (the grid icon on the toolbar).
2. Check the Snap options. If an option like Snap to Grid is active, tap it to toggle it off.