You can create an orthogonal on annotations composed of segments: line, polyline, polygon, measure, angle and rectangle.


Creation of an orthogonal:

1. Select one segment by clicking on it with the left mouse button. When a segment is selected, some green circles are displayed around its points. (Multiple segments can be selected by clicking on the left mouse button while holding the 'Shift' key. You can unselect segments by clicking on it while holding the 'Ctrl' key.)
2. Click on the "2D Actions" button of the 2D Viewer window. A menu will appear under your mouse cursor.
3. Click on "One side orthogonal" or "Two side orthogonal".

You can also create orthogonals by 2 others methods: by the top menu of the 2D viewer window, or by the context menu.
See "How to launch actions".

Modify the extremity point of the orthogonal:

1. Select the orthogonal object by clicking on it with the left mouse button. When an orthogonal object is selected, you can see a green circle at the extremity and at the intersection with the segment.
2. Bring your mouse above the extremity, press the left mouse button and hold it.
3. While holding the left mouse button, drag your mouse to move the extremity of the orthogonal.
4. Release the left mouse button.

Modify the orthogonal position:

1. Select the orthogonal object by clicking on it with the left mouse button. When an orthogonal object is selected, you can see a green circle at the extremity and at the intersection with the segment.
2. Bring your mouse anywhere between both green circles of the orthogonal, press the left mouse button and hold it.
3. While holding the left mouse button, drag your mouse to move the position of the orthogonal object.
4. Release the left mouse button.