Delphi-PRAXiS - Delphi features that I was not aware of

The other day I came across a feature of Delphi that in my 18+ years of using Delphi have never used, it is the 'Hide Non-Visual Components' (Ctrl+H) when design a form. I came across this because another Developer pointed out to me that he could not see the menu controls on a form. I thought there might be an option somewhere and on the right click menu was the option.

I have never used this feature and it got me thinking what other features are there that I am not aware of (Delphi Berlin) and a