Polyline
As many points as you likeJoins points into a closed shape.
What it looks like
The numbered dots are where you click. Once drawn, you can grab those dots and move them.
How to draw it
Click the vertices in turn; the last point joins back to the first and the shape is filled.
When to use it
Use it to enclose a stretch whose shape a rectangle cannot follow.
In SQMATE
What you draw stays
Lines you draw are saved to that symbol's notebook. Open the symbol again and they are still there.
Editable afterwards
Grab the points to move them, and change colour, width and line style. Undo works too.
Shares as drawn
Send the chart as a single link. Whoever opens it sees the same lines.
Related tools
Drawing tools are a way to organise your thinking. A line you draw does not decide what price will do.