Translations:Sketcher Micro Tutorial - Constraint Practices/26/en

From FreeCAD Documentation

4. We will draw the same square fully constrained, and centered at the origin. When you create the new sketch, make sure the Auto constraints option is disabled.

4.1. Click on Create polyline, then trace four lines in the general shape of a rectangle around the origin.
4.2. Select one horizontal line, and press Horizontal.
4.3. Select the other horizontal line, and repeat the constraint.
4.4. Select one vertical line, and press Vertical.
4.5. Select the other vertical line, and repeat the constraint.