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How to do that depends on the specific browser, but it’s typically one of the options when you clear your browser’s cache. You can deal with this easily by clearing the information in your browser. Put another way, the fact it’s happening in email is immaterial it’s just remembering, “There’s this field called ‘To’ it was on this page this is what I remember it having been used for in the past, so I’ll make some suggestions.” It has nothing to do with email it just happens to work there as well as in all those other places. The browser watches for fields that you type stuff into - any field on any webpage - and then remembers what you’ve typed in those fields.
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While you may think your email program is filling something in, it may actually be your browser - Edge, Firefox, Chrome, and so on. The most common source of autofill is your web browser.
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