Did you not get a Mercedes owners manual?
I would expect a common service issue to cover it under maintenance.
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Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain
Instructions for the instrument cluster start on page 175. The Service Menu is covered on page 178.
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I just reset mine and it is really a procedure. It is not well laid out in the owners manual. I went thru several YouTube vids on subject and finally found a good one. Attached is not the vid I used, but it is a pretty good one as well.