Hello.

How can I interchange the key shortcuts for inserting a line break with the paragraph break one?

They are currently inserted by pressing Shift+Enter and Enter respectively. I would like to reverse that assignation.

I would like to get a new paragraph break when pressing Shift+Enter, and a new line break when pressing Enter.

The reason is because is much more common to insert new line paragraphs and it's more comfortable to use a single key.

How can I do it?
I've tried in Options -> Customize Ribbon -> Customize Keyboard Shortcuts -> but I Can't find the related functions there.

This is not a good idea. A line break does not create a new paragraph. It breaks the line within the same paragraph, and far from being common, it has relatively limited use.

The Enter key creates a new paragraph and if the spacing between paragraphs is not to your taste, you should address that with the use of styles.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com

Yes, but at the end it's not the same. Word recognizes it as a different paragraph, at this affects things such as justification and the structure.
Most of the time I'm not interested in having a new paragraph but just a new line.
Anyway, if I need a new paragraph I can use Shift+Enter.

Regards