Final answer:
Switching from Parametric Modeling to Direct Modeling typically removes all previous parametric relationships in the timeline, allowing for greater design flexibility but losing the design history.
Step-by-step explanation:
The statement that switching to Direct Modeling from Parametric Modeling removes all previous relationships in the timeline is generally true. Parametric modeling is defined by its use of relations and constraints to maintain design intent. When one switches to direct modeling, these constraints and relations are typically not maintained, offering more freedom to modify the geometry without the burden of past constraints, which makes the design process more flexible but at the cost of losing the history or timeline. Therefore, switching to direct modeling would typically remove the parametric relationships that were previously established.