Part/sketch modeling (locking dimensions) question

Hi guys I have a general question. I have used NX, Solidworks, CATIA, and other software before. I'm trying to learn how to sketch in both the sketcher and in the part function.

In those other design softwares when a solid is fully constrained, the sketch wouldn't move. I'm getting used to this software but the issue is even after every dimension is correct and purpled out; i'm still able to drag the entities and the dimensions change.

Do I have to lock each dimension after creating the sketch so it won't change or move? Or does Creo act like solidworks and CATIA where once the sketch is fully constrained it shouldn't move?

Thanks for the help guys.