Viewer and not Modeler

Hi, I’m using a BpmnViewer to show up some diagrams that must not be editable, but i wonder if there is a way to make the zoom in/ zoom out still possible. Because for now it isn’t. i can just visualize the diagram but i cannot move the space to see it better.
My viewer:
var secondViewerOnly = new BpmnViewer({});
of course i attach my container in a second moment

Answered in BpmnViewer with zoom option - #3 by Alessia_Volpi