It's important to note that the actual slice names in this article may vary, depending on whether you have a HDD or SSD, and whether you've upgraded macOS through several versions.
For example, if you upgraded to Catalina from a pre-APFS version of macOS on an SSD, "Macintosh HD" will likely be disk1s5 in the APFS container scheme. In this case, "Macintosh HD - Data" will be disk1s1, "Preboot" will be disk1s2, "Recovery" will be disk1s3 and "VM" will be disk1s4.
For example, if you upgraded to Catalina from a pre-APFS version of macOS on an SSD, "Macintosh HD" will likely be disk1s5 in the APFS container scheme. In this case, "Macintosh HD - Data" will be disk1s1, "Preboot" will be disk1s2, "Recovery" will be disk1s3 and "VM" will be disk1s4.