Improperly removed Bootcamp
See terminal info below;
Khamars-MacBook-Air:~ Khamar$ diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *251.0 GB
disk0
1: EFI EFI 209.7 MB
disk0s1
2: Apple_APFS Container disk1 189.0 GB
disk0s2
/dev/disk1 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +189.0 GB
disk1
Physical Store disk0s2
1: APFS Volume Macintosh HD 181.8 GB
disk1s1
2: APFS Volume Preboot 22.1 MB disk1s2
3: APFS Volume Recovery 517.8 MB
disk1s3
4: APFS Volume VM 1.1 GB disk1s4
So I have a missing 61.8 GBs.
This command (sudo diskutil cs revert /dev/disk1) returns the following result;
/dev/disk1 is not a CoreStorage Logical Volume