MDGM 7 - Redo/Undo buttons not available

Hi Experts

I have noticed that the Redo/Undo buttons that's available in MDGS 7 is not available in MDGM 7. Is this just how MDGM 7 works or must I activate something to get these buttons available in the change requests?

Below is a screen print of these buttons in MDGS 7

Regards

Danie