How to merge 2 partitions on macOS

I have an MBP running macOS High Sierra. There are 2 partitions. How can I get rid of BC1, and merge the space into Macintosh HD? Know very little about macOS. Please help. Thanks!

Disk Utility

diskutil list


I think I got the answer.

  1. Open Disk Utility
  2. Select the root of Internal drive on the left pane.
  3. Click Partition button on the top pane.
  4. Delete un-wanted partition(s).

It's easy if you know!

Disk Utility