Ability to change text type in multi combined col

Hi i have a email address list mail. from col 1-6 When i have my starting email as a Phone number EG: 1234567890@somthing.com It recognize it as a number col. Issue is the filter i create keeps changing. Depending if i have Text @somthing.com and number@text.com. Can we please add a force type to be able to change here for all combined col
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