How can I remove sort of variables?

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Hello.

I have several variables in a collection.

I have them in some order of my own way.

But sometimes I click the table’s head by mistake and they get sorted alphabetically.

After that, I can never reorganize them like before.

When I try to drag one of them, they only says “Remove sort to reorder.”

But how?

reclicking the column’s head, clicking anywhere else, reopening the collection, and other attempts I tried all failed.

The only solution I found is, to export the collection into a json file, delete the collection and import the json file to reopen the collection.

but this shouldn’t be the right way, is it?

How can I remove the sort of variables?

And why am I the only one who suffers from this?
I searched “remove sort to reorder” in Google and this community, and I found nothing like mine.

Thank you.