Can you set Standard and Custom fields as unique or required using the Property feature?

See the answer below.

No, only custom fields.

Yes, you can set both standard and custom fields as unique or required using the Property feature in Lightning Experience.

The Property feature allows administrators to configure various attributes of a field, such as the field's label, data type, and visibility. Unique and required are two additional properties that can be configured using this feature.

To set a field as unique, an administrator can navigate to the Object Manager in Setup, select the object that the field is associated with, and then select the field. From there, the administrator can select the "Property" option and then check the "Unique" checkbox.

Similarly, to set a field as required, the administrator can navigate to the same field properties and check the "Required" checkbox. Once marked as required, users will be unable to save a record without entering a value for that field.

It's important to note that the ability to set a field as unique or required using the Property feature may be limited by the object's settings and validation rules. For example, an object may already have validation rules that prevent certain values or combinations of values from being entered in specific fields. In such cases, setting a field as unique or required using the Property feature may not be possible.