Click the label you want to apply and choose Apply. You can also select
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You can also select "Create new".
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Name the new label, choose whether you want it to be a sub-label, and click "Create".
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You can also label an email in this way while you're composing it. Click the three dots in the lower-right corner of the email draft.
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Select Label.
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Click the label you want to apply and choose Apply. You can also select Create new, name the new label, choose whether you want it to be a sub-label, and click Create.