The manage fields page will let you view all existing lead fields as well as any custom lead fields you've created.
You will notice the group column which will show you where the specific field will be shown on the lead profile. In the last column, you may see several icons which signify various properties of the field:
- Lock icon - These fields are unable to be removed as they are used by the core installation.
- List icon - These fields can be used as filters of smart lists.
- Asterisks icon - These fields are required when filling in the lead form
- Globe icon - These fields are publicly updatable through the tracking pixel URL query (see [Lead Monitoring]](http://docs.mautic.org/leads/lead_monitoring.html) for more details).
The checkmark which shows before each label title is a clickable toggle which will publish and unpublish the field.
You can create additional custom fields and define the data type you want that field to hold. In addition to the data type you will also select the group for that particular field. This will define where the field displays on the lead edit and detail view.
