How to remove an external drive from time machine backup

In time machine I also backup to an external drive. I recently bought a new external drive and thats working fine. However, it still wants to backup to my previous drive which I dont want to use. In time machine preferences I see the old and new drive listed. Both are greyed out so I cannot deselect the older drive.
Suggestions?

mhattonmd wrote:
So when I open time machine preferences I see time machine and both external drives listed. If I click on options I see both external drives but I cant select either as they are both greyed out.
If you see them both listed on the initial screen of TM prefs, they are both selected as backup drives. They are not being backed up. They are being used by Time Machine as a destination. You need to use “Select Disk…” to remove the external drives from the destination drives. Select Disk does not choose the drives you want to back up. It chooses the drives you wan to back up to.

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