I use webdav for my vaults.  In settings/vaults I have Primary set as not connected.  I confirmed that by clicking on the Vaults widget in the upper left corner and it confirms Primary is not connected.

Yet when I go to all items I can see entries that are in the Primary vault.  

Why is that?

It seems to me that if a vault is not connected I shouldn't see any data in that vault.  

When a vault shows as not connected, it simply means that Enpass is currently unable to sync that vault with the WebDAV server it does not mean the vault has been removed or its data erased from the local device.

Enpass stores vault data locally, so even if the vault is temporarily disconnected from the sync source (like WebDAV), you’ll still be able to access the previously downloaded or saved items from that vault. This ensures uninterrupted access to your data.

If you’re looking to fully disconnect and remove the vault data from your device, you would need to manually delete the vault from within Enpass.