Use the Notes app Use the Markup tools.
Adjust the handwriting area: Drag the resize handle (on the left) up or down.
Tip: You can search handwritten text (in supported languages) in Notes. If the note doesn’t have a title, the first line of handwritten text becomes the suggested title. To edit the title, scroll to the top of the note, then tap Edit.
In the Markup toolbar, tap the Lasso tool > Notes > Lines & Grids.