Sketch and Infinite Canvas do different jobs

Sketch builds a page from a layout drawing and text. The brush marks tell the model where the frames sit. The notes tell it who speaks and how the shot is framed.

Infinite Canvas starts from a picture that already exists. You mark a region and generate that patch. Use it when the page is right except a hand, a sign, or the eyes. Do not expect Sketch’s brush to inpaint one corner of a finished panel.

What each tool on the bar does

ControlEffect
Layout brushFrame borders and staging lines, used as composition reference
Eraser / clearRemove strokes. Notes stay.
Text markerA numbered frame you describe on the side
@ characterInserts a cast member. The cast has to exist first.
Page noteExtra direction for the whole page
GenerateOne multi-panel page, written back to a bound panel or stored in the gallery

An empty canvas — no strokes and no notes — will not generate. Put down a layout or a sentence first.