From FreeCAD Documentation
| Name
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Description
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| Show section 'Advanced solver control'
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If checked, the sketcher dialog will show the section Advanced solver control to adjust solver settings.
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| Improve solving while dragging
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If checked, a special solver algorithm will be used while dragging sketch elements. This avoids that the sketch flips around while dragging. It is an improvement for most cases, however for complex sketches this option can increase the time to solve the sketch.
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| Auto remove redundants
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If checked, new constraints that are redundant are automatically removed.
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| Esc can leave sketch edit mode
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If checked, the Esc key can trigger exiting sketch edit mode. The option to disable this may be useful for users who are used to pressing Esc as part of their workflow in other CAD solutions but don't necessarily want to exit a sketch.
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| Notify automatic constraint substitutions
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If checked, you will be informed with a dialog about constraint substitutions. For example if the endpoints of two arcs are connected with the coincident constraint and you reconnect the arcs using the tangent constraint, the coincidence constraint will be substituted by the tangent constraint and you will get a popup dialog telling you this.
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| Unify Coincident and PointOnObject introduced in version 0.22
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If checked, the Coincident constraint tool and PointOnObject constraint tool are unified in a single tool.
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