Git merge

Hi,

I don’t know how I merged them once (like the bottom of the image)

スクリーンショット 2020-08-03 16.59.50455×513 24.3 KB

But now I can not merge this pink colored “BestinX/master” into “master”.

I’m not able to find even this “merge” on the menu.(from the document)

how can I solve this?

thanks,