Delete a Custom Field in Marketo delete-a-custom-field-in-marketo
You may want to get rid of a field you created in the past if you no longer have a use for it. Unfortunately you can鈥檛 delete fields in Marketo, but you can hide them from the user interface.
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Go to the Admin area.
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Click Field Management.
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Click the Field Actions drop-down and select Hide Field.
For detailed step-by-step instructions, see hide and unhide a field.