Very strange. There is no function to hide a field in the Manage Library Fields dialogue. I can click on every field that exists in the MC Library, whether Standard or User fields. I just can't make many changes to the Standard fields. You must be hiding this field in some other place. For reference, see the image. I have no Status field. But there is nowhere to hide a field in this dialogue.
I'm trying to think of anywhere in MC that you can "Hide" something, and the only place I can think of is hiding TV Channels under Television.
I did manage to sort of replicate what you are saying by;
Adding a [Status] field to MC via the "Manage Library Fields" function.
Creating a copy of my Audio/Artists View and adding the [Status] field as a column.
Deleting the [Status] field via the "Manage Library Fields" function.
Going back to my View, the [Status] field is still shown as a column.
Right-clicking on any column in the View [Status] was still included in the list and was ticked.
Unticking the [Status] field and closing the field list.
Right-clicking on any column in the View and scrolling down, the [Status] field is no longer in the list.
So, is that what you were doing? If so, that would be perfectly normal it seems. Deleting a field doesn't remove it from a View. But it does delete the field and all the data the field contained. You have to go in and remove the field from any View it is included in. Once you have done that, it isn't hidden, it is gone. It isn't coming back either.
If the above isn't what was happening for you, could you unhide the Status field and then post an image showing how you would hide it?