Check if your value is a type of string.

Once the form is rendered with outputService.generatePDFOutput() service,  the dynamic behavior of the forms will not work, i.e. button, checkbox click, etc.

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Can you please share your form to look into?

Removing the package from the package manager should work for you.

resetData will reset all the form fields.  To reset data for a few fields in the form, you can create an array of fields and then pass that array to a function and set data to null for each field by traversing the array. This will help you write less code.

You can set it in the tab Object>Field>Appearance to Underlined, but the underlined will come in the bottom always

Can I see your form?

Delete service is not available OOTB, you can create a custom service for delete operation in Java by creating a servlet/Rest service, etc.

Please follow this :   https://docs.mktossl.com/docs/experience-manager-65/forms/getting-started/create-first-interactive-communication/create-form-data-model0.html