The custom fields that appear on the tenant application can be marked as required by editing the custom field in the Settings page.
Navigate to the Settings page, then click on the Custom Fields tab.
Find and open the Tenant dropdown.
Find the custom field you want to mark as required. Open the 3-dot menu next to the field and then click Edit.
Once the pop-up opens up, locate the Requirement Option dropdown and select the requirement criteria you need.
Once a field as been marked as required, the applicant will get an appropriate message prompting for those fields to be filled out.