Jan van den Hemel writes: You can draw Grease Pencil strokes on different places in the 3D viewport. To have very precise control over the placement, you can enable the Canvas overlay, which shows you the Drawing Plane.
from BlenderNation https://www.blendernation.com/2022/11/12/how-to-use-the-grease-pencil-drawing-plane-canvas-option/
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