The selection behavior when you add a dimension to a sketch has improved.
If you select an endpoint or sketch point and then accidentally click in the graphics area, the first selected point is retained so you can try again to select a second entity.
If you select an invalid entity to complete a dimension, such as a spline, ellipse, or parabola, instead of an error dialog box, a tooltip warns that a dimension cannot be created from the currently selected items. Move the pointer to dismiss the message. Again, your first selection is retained so you can select a second entity.