i have muliple partions unknown mac 10.15.7

The advice from BDAqua to first backup your data and then to erase the drive and start over is good, solid advice. I second that.

However, after you backup your data, rather than immediately erase and start over, you might simply delete the volumes that we know are not any of those normally installed. It'll only take a moment, and if it works you will reclaim any storage they currently use and you can probably just continue to use the Mac as you normally would.

These five APFS volumes should be deleted:

• disk1s4

• Untitled - Data

• disk1s6

• Unknown Data 2

• Unknown

Select each and then click the Volume delete button (–) above.

This will leave only the volumes "Mac HD" and "Mac HD - Data" which are the two that normally should be visible and mounted. After that, you can confirm the proper APFS volumes are present by launching the Terminal app and running this command:

diskutil list

The resulting list of APFS volumes should closely resemble the five that BDAqua has listed in their post.

If the above doesn't work, then you can of course proceed to wipe the drive and start over.

Yes, was just trying to show what the Partitions should be. there willbe multiple partitions, just not the ones you show.

You need to backup & clone your data then Erase the Drive & start over with just the one big Partition & let the Installer make the correct Partitions.

Looks like you reinstalled to a Partition in the past instead of to the whole drive...

  #:            TYPE NAME          SIZE    IDENTIFIER

  0:   APFS Container Scheme -           +1.0 TB   disk5

                 Physical Stores disk1s2, disk0s2

  1:        APFS Volume Macintosh HD      11.3 GB  disk5s1

  2:        APFS Volume Macintosh HD - Data   672.1 GB  disk5s2

  3:        APFS Volume Preboot         84.4 MB  disk5s3

  4:        APFS Volume Recovery        529.0 MB  disk5s4

  5:        APFS Volume VM           2.1 GB   disk5s5

Good advice, thanks. :)

Great to hear my friend! :)