# Field Options

All field types

* **Identifier** - Used in the markup. Allowed symbols : letters, numbers, underline and dash. Important! It should be unique within the group.
* **Default Value** - Set up a default value, only used when the field value is empty.
* **Show When Empty** - By default, empty fields are hidden. Turn on to show even when the field has no value.
* **Open link in a new tab** (For Link field types) - By default, this setting is inherited from ACF, if available. Turn it on to always open link in a new tab.
* **Values delimiter** - If multiple values are chosen, you can define their delimiter here. HTML is supported.

### **Gallery field type**

### **Repeater and Group field types**

### Method 1

Using the Parent group and Parent field. ([See how to setup nested repeaters](/advanced-views/guides/display-nested-repeater-fields.md))

### Method 2

**Sub Fields** - Repeater and Group field types

* **Add Sub Field** - Used for adding sub field rows to your Repeater field\
  Each sub field field can potentially have the same Field and Field Options depending on the ACF field type.


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