Boox Color Series, User Manual, Page: 95 / 167

Canvas Editor
The default canvas size is 1x1, same as the screen size.
The canvas size can be adjusted to 1x2, 2x1, 2x2 or custom size.
The max canvas size is 2x2. You can customize the canvas size within the
max size. You can adjust the canvas size by dragging the canvas.
Canvas adjustment base is located at upper left corner. Drag left or
downwards to expand the canvas.
When you switch from the large canvas to the small canvas, the strokes
outside the canvas range will not be displayed, but will not be cleared. But
the strokes can be redisplayed after you switch back to the large canvas
Canvas Adjustment will cut the redundant blank part of the canvas based
on the outermost strokes position.