Lost Command Labels on Quick Access Toolbar

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At the top right of the bar above the ribbon, there is a horn (with a tip) promoting "New features. Try it now", click on the horn, it will show something like a Help panel, scroll down and there is a switch:

"Try the new experience Off (O__)" just click to turn it "(__O) On".

You will need to restart the Excel, the labels will be shown by default and the option to hide them is at the QAT menu.

WARNING: the default green bar will disappear, everything will become (very pallid) grey by the default in latest versions of 365, I didn't like it, so I am thinking to have everything back (green, no labels) turning the switch off, or I will try some other solution besides UXing the entire Excel.

I hope this helps, please advise if it doesn't. Good luck