How to delete a boot partition from MacOS Catalina A few years ago I created a second boot partition on a MacBook, called "BootOS". I would like to delete this partition and merge the space back into the remaining partition.

I have found a question/answer that describes how to do this on El Capitan, but the output from diskutils list on Catalina looks sufficiently different for me to ask again. 

Can anyone suggest suggest how I should go about this?

diskutil list : 

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                 Apple_APFS Container disk2         937.0 GB   disk0s2
   3:          Apple_CoreStorage BootOS                  62.7 GB    disk0s3
   4:                 Apple_Boot Recovery HD             650.0 MB   disk0s4

/dev/disk1 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS BootOS                 +62.3 GB    disk1
                                 Logical Volume on disk0s3
                                 98445A01-48FA-4E17-8CDE-61C46B885B90
                                 Unencrypted

/dev/disk2 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +937.0 GB   disk2
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD - Data     850.8 GB   disk2s1
   2:                APFS Volume Preboot                 85.1 MB    disk2s2
   3:                APFS Volume Recovery                526.6 MB   disk2s3
   4:                APFS Volume VM                      1.1 GB     disk2s4
   5:                APFS Volume Macintosh HD            11.0 GB    disk2s5


diskutil cs list : 

CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 1C402269-ED55-46B6-B2B3-2C83C455625C
    =========================================================
    Name:         BootOS
    Status:       Online
    Size:         62708625408 B (62.7 GB)
    Free Space:   18984960 B (19.0 MB)
    |
    +-&lt; Physical Volume 8A71BD1E-3901-4573-8ABA-B635F6957E9B
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s3
    |   Status:   Online
    |   Size:     62708625408 B (62.7 GB)
    |
    +-&gt; Logical Volume Family CD18710F-BC90-4354-843B-C8B35B34274A
        ----------------------------------------------------------
        Encryption Type:         None
        |
        +-&gt; Logical Volume 98445A01-48FA-4E17-8CDE-61C46B885B90
            ---------------------------------------------------
            Disk:                  disk1
            Status:                Online
            Size (Total):          62337318912 B (62.3 GB)
            Revertible:            Yes (no decryption required)
            LV Name:               BootOS
            Volume Name:           BootOS
            Content Hint:          Apple_HFS
Disk Utility.app in the /Applications/Utilities/ folder would be my recommendation. That's generally the easiest/safest way to make changes to partitions.