creating a double dotted note

In 3.6.2:

"How do I create a double dotted note?"

Here is what I see in MS 4.2 after a Factory Reset to get the default toolbar:

To get additional optional icons, you need to open the Customise toolbar icon - it looks like a gearwheel. The invisible double augmentation dot has a "closed eye" icon, so you should change that to "open eye" to make it visible on the toolbar: