The Search panel helps you to find elements in the model tab that is currently open.
The panel is available for the following editors:
BPMN Editor
Execution Editor
Mapping Editor
The search panel is hidden by default. If using the panel preset, you can find the icon to display the search panel in the right upper corner of the diagram pane.
Click on the icon to display the search panel in the sidebar.
To return to the panel preset, go to the user preferences and use the button Reset Panels.