FINALLY! It was Cajun Heat stating that he had to try over and over again that gave me the patience to finally see what the problem was. You do start by holding the Home button for 5 seconds. Let go and quickly press the OK (4 arrow) FOR AT LEAST 20 SECONDS and voila, there was the Workshop Tools menu! I have attached the whole brake pad replacement procedure I went thru today to change my pads. Total success!
One more point, don't know if placing your keyfob in the console holder as per W205C43PFL's suggestion made any difference, however I did place it there before starting the routine.
Oh, by the way, the dealer was full of crap telling me that the only way to access the 2021 menu was for them to connect their OBD and thru Xentry!

 

Nice! Happy to hear that you figured it out, now you just proved them wrong and proved yet once again they are stealerships xD. Thanks for sharing the process with us forum members as well, it will most likely help others with this model who are struggling. Thanks for mentioning me but I am going to return the credit back to forum member Cajun Heat as it was his suggestion to try putting the keyfob in the centre console holder, I just came across it and remember about it hence I mentioned it here.