Note:
If you reach the maximum number of custom Form Fields for your site, learn to archive or permanently delete custom Fields.
Forms
Maximum Form fields
Add up to 50 total fields in a single Form and manage up to 50 custom Form fields per site.
You can add up to 50 total fields in a single Form and create up to 50 custom Form Fields in your site. This limit applies across all Forms on your site, not per individual Form.