I have created a hierarchy SmartArt in PowerPoint (Office 2016 on Mac) about a month ago, saved as pptx on Google Drive and kept editing and expanding it. Lately, I have opened the PowerPoint and wanted to continue editing it but the hierarchy has forgotten that it is a SmartArt, so when clicking in it, only the tab 'Shape Format' instead of 'SmartArt' appears. It appears as if it has been created by adding single objects.
Can someone help to revert it back into a SmartArt?
Much appreciated as it's several A3 slides filled with various org's.
Many thanks, Barbara