How to open small special character window

In LibreOffice 6.0, I have seen a small window that contains recently used and favorite special characters. I thought it opened via a small drop-down list next to the special characters icon in the Standard toolbar. However, there is no such drop-down list there.

So, how do we open that small window? How could I forget such a thing?

Right click on the toolbar → Visible buttons → scroll a bit: you’ll see there is a second button for “insert special characters” and that second button features the drop down menu. You need to activate that second button (and deactivate the first one).

EDIT:

https://wiki.documentfoundation.org/ReleaseNotes/6.0#GUI

The button was hidden after the betas, I think, no idea why thy reactivated the old one before the RCs.

Thank you. It is puzzling that such a useful feature is so hidden. I wonder what the reason is.

I just tried this and found that both buttons can work on the Standard toolbar at the same time. For some reason, they use identical icons, but do different things.