The Pen tool (like the other annotation tools) is designed to deactivate after one use. You have the option to double-tap on the Pen button (or select Lock Annotation Tools in the Settings) to have it stay on for multiple strokes.
The Pen tool (like the other annotation tools) is designed to deactivate after one use. You have the option to double-tap on the Pen button (or select Lock Annotation Tools in the Settings) to have it stay on for multiple strokes.