In the Customization area, click Customize the System.
Under Components, expand Entities, and then expand the entity you want.
Click Forms. In the list, click a form to edit it if it has a Form Type of Main.
On the Home tab, in the Select group, click Body.
Select the tab, section, field, or IFRAME that you want to remove.
Note: If a section or field is locked by default, it cannot be removed. If you have locked the section or field, you must unlock it before removing it. More information: Edit form field properties, Edit a section
On the Home tab, in the Edit group, click Remove.
In the confirmation message, click OK.
When you finish editing the form, click Save and Close to close the form.
You can preview how the main form will appear and how events will function:
On the Home tab, click Preview, and then select Create Form, Update Form, or Read-Only Form.
To close the Preview form, on the File menu, click Close.
When your customizations are complete, publish them:
To publish customizations for only the component that you are currently editing, on the Home tab, in the Save group, click Publish.
To publish customizations for all unpublished components at one time, click Publish All Customizations.