If you are unable to rotate a group or collection of selected objects on your canvas, the likely culprit is that one of the currently selected objects is a line or arrow.
If this is the case, you will see a faint message in the top left corner of your canvas that reads "Selection contains lines or arrows and cannot be resized or rotated":
Currently, selections containing lines or arrows cannot be rotated as part of a group and will need to be rotated separately by clicking and dragging the endpoints of the line or arrows.
Tried everything and still experiencing issues?
Please contact our support team at firstname.lastname@example.org if you are experiencing issues rotating objects or selections of objects that do not contain lines or arrows.