When you open an implemented design, placement and routing results are displayed in the Device window. In the Timing Results window, you can select timing paths to highlight the placement and routing for the selected path in the Device window. You can also interactively edit placement and routing to achieve design goals and change design characteristics, such as LUT equations, RAM initialization, and phase-locked loop (PLL) configuration. For more information, see this link in the Vivado Design Suite User Guide: Implementation (UG904).
Important: Changes are made on the in-memory version of the implemented design only. Resetting the run causes changes to be lost. To save the changes, use the Save Checkpoint command, as described in Saving Design Changes to Design Checkpoints.