Six tools
Rectangle, Ellipse, Line, Arrow, Pen, and Text sit to the right of the divider in the toolbar at the bottom of the screen. TheR, O, L, A, P, and T keys pick them up directly.
Pick a tool and a drawing layer covers the canvas so cards can no longer be grabbed, and an Esc to exit drawing hint appears above the toolbar. Draw a shape by dragging it to the size you want; for text, click once where you want it placed. After one shape you return to the select state, with the pen as the only exception — it keeps drawing. Esc is both how you back out of a half-drawn shape and how you leave drawing.


Pick a tool and drag to draw. Esc gets you out.
Shape properties
Select exactly one of the things you drew and the shape properties panel appears over the canvas. Drag its header to move it, and use the chevron on the right for Collapse panel and Expand panel. Which entries appear depends on the shape you selected.
Stroke color is eight swatches: the default plus seven colors. Sloppiness has three steps, running from a line as straight as one drawn with a ruler to a shaggy line that looks gone over twice. Line & arrow has three: a straight line, a gentle curve, and a line that turns at right angles. A newly drawn line or arrow starts as a curve. Pick a color under Fill color and Fill pattern appears below it, offering hachure, cross-hatch, and solid; go back to No fill and it disappears.


The properties panel that appears when you select a single shape. You can drag it around and collapse it.