How to stop 'FROM' in email header column from changing to 'TO'?

[phleezy]

My farthest left email column header has always been 'FROM'. Recently it arbitrarily changes to 'TO' so if I'm copied on an email it sorts by the person who is the main recipient vs. the sender. I don't want this; I want it to sort by 'FROM', or the original sender. How can I stop this from happening?

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