Enabling the Allergen Subtab in Custom Forms
If you are not able to view the Allergen subtab on the Items page for some custom forms, perform the following steps:
To enable Allergen subtab in custom forms:
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              Go to Customization > Lists, Records, & Fields > Item Fields. The Custom Item Fields page opens. 
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              Click an allergen field link. For example, Celery. 
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              On the Custom Item Field page, click the Apply to Forms button. 
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              On the Apply Custom Fields to Forms page, for the custom forms, check the box in the Show column. 
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              Click Save. 
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              Repeat steps 2 to 5 for all allergen field links.