How to disable items from Menu

Hi for the items in the MENU can i remove or disable the Channles and Messages section is it something that relevant and why? also as an admin user for example i can see all the entire menu but a non admin user should they the have that?
my users requested that section is annoying i just want to desactived… please

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If you don’t want to have the Personal Messages or Chat features you can disable them from your settings using personal message enabled groups and chat enabled (you can also make chat available to only certain groups instead using chat allowed groups and direct message enabled groups)

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Or is it just need to hide those, because all of that makes sidebar crowded and there is another way to get all that?