Page Numbering and Layout Issue in Book Formatting

@Mateomono 

You need to start a Section:

Enter EVEN value:

The other option would be to UNSELECT "Allow Document Pages to Shuffle" - which might sound counter-intuitive - but if you think from InDesign's perspective - it makes sense 😉 it means that you are prohibiting InDesign from controlling automatic reflow of the Pages:

then move pages close together - I'm drag&dropping right page till there is this extra line:

but then you'll end up with something like this:

And then you'll have to move LEFT page to the left side of the spine line:

to get to this:

But this second method - will make your document look llike this - if you'll start adding new pages:

New pages will ALWAYS be added on the right side of the spine.

Where the first method - will produce correct spreads:

But you won't be able to start from the ODD number - as this would require unchecking "Allow Document Pages to Shuffle" and all your new pages will end up like in the second method - on the right side of the spine and you'll have to move them manually. 

Unless, of course, you'll be modifying an existing document - after unchecking "Allow Document Pages to Shuffle":