Remove partition from WD 4TB External Hard Drive on a Mac?

I have a WD 4TB hard drive that I partitioned into two hard drives on my Mac.
I’d like to remove the partitions and have one 4TB hard drive again.
How can I do that?

You would use Disk Utility on your Mac. Select the Drive from the left side, click on the Partition Tab. Choose a single partition and then choose GPT for the volume type and HFS+ Journaled for the format type if you just want to use it on a Mac. All the steps can be found here.

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That was the info I needed.
Thank you