Sketcher > Modifying a Section > Sketcher Hints
  
Sketcher Hints
Consider the following hints when using Sketcher.
When you create fillets between non-horizontal and non-vertical lines, create a point at the intersection of the lines to dimension to theoretical sharps.
You can specify dimensions to lock or unlock using the Toggle command on the shortcut menu.
The locked dimensions appear in orange. Alternatively, set the color for locked dimensions by clicking File > Options > Environment > Sketcher.
When you lock all dimensions, you cannot change the section, only drag the section to another location.