QGIS Layout: How to group items?

At 3.12.3, I need to group the two items highlighted in this screenshot:

According to the QGIS documentation: "To create a group of items, select more than one and press the Group button…" [Emphasis added]

But HOW do I select more than one item???

Here’s what I’ve tried:

In my example above, I select the first item by clicking on either one of the two, which highlights it. I then ctrl-click the second item. But that just switches the selection and highlights the second item; it is not added to the selection. Same thing when I try shift-click.

Thanks in advance!