How can I have Macintosh-data after a reinstllation

Hi,

Beofre I got some problem with my MacBook Pro, I could see Macintosh and Macintosh-data.

I suppose, Macintosh contain the OS and the Macintosh-data contain the data.

I formatted my disk and I reinstall Ventura and I am going to upgrade to the newest OS version.

But I observed that I only Have one volume : Macintosh.

I like to spirited the OS and the Data.

How can I have Macintosh-data?

Should I format my Disk, create to volume and install my OS on Macintosh?

What should it be the size of the volume for the OS and how Ventura will know to have the data dissociate from the OS volume.

Or can you explain, what's Macintosh-data?

Many thanks