2 partitions but just one run

I bought an external disk My Book 5TB last week. I tried to formate my disk for MAC and PC. It’s running but now I have 2 partitions of 2TB who appear. I can use just one of 2TB. Help me please ! I bought 5TB not 2TB !!

Hi, what partition table did you chose when formatting the drive?

Hi, I used disk management to format my disk.