You can’t remove this volume because the preceding volume cannot be resized.
I am unable to able to shrink volume adnan and increase the size of main volume. Please help on it.
Before doing or attempting anything - strongly suggest
1 - Copy ALL the data on the " APFS Volume adnan " to a Safe Location like an External Drive incase you need that data later
2 - The follow the instruction in link below to Remove the " APFS Volume adnan " Volume
Add, delete, or erase APFS volumes in Disk Utility on Mac - Apple Support (CA)