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Default UI Menu: Modes/Snaps/Extended Ortho

Ribbon UI Menu:

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Snap to points located orthogonal from existing points. Show Magnetic Point must be turned on.

  1. Start a polyline with two linear segments, then start the third segment like this:

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​ 2. To end the third segment, first hover over the start point. This displays an auxiliary line extending vertically from that point. You can snap to points along this line.

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​ 3. Horizontal auxiliary lines can also extend from this point, when the cursor is to the right or left.

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Note: If Always show auxiliary lines is checked in the Drawing Aids window, the auxiliary lines will be displayed, even when you move the cursor away from them.