Grouping shapes, text, and connectors let you a part of the diagram lock so you can move, format the grouped items with a single click. You can also move grouped items within the editor in one go.
To group items in the canvas;
- Select all the items you want to be grouped (make sure every shape/text box/image is fully selected)
- Click on the 'Group' icon from the contextual toolbar
You can lock shapes together after grouping
To edit shapes again individually, you can simply click on the grouped items and select 'Ungroup'