[MlMt] Why can't I hide the "To" column???

[leo]

Hi all

In the column picker I cannot hide the “To” column. See this 
marked-up screenshot:

![](cid:E6AB9B4E-75AB-41D5-95DC-DA584FC444CB at halloleo.hailmail.net 
"Screen Shot 2024-01-12 at 12.01.18_marked.jpg")

Any idea why? And what I can do about it?

Many thanks,
Leo
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