When creating new columns within Affinity, you will have the option of setting up a column with either a List field or Global field. This setting determines whether the column will exist amongst all the lists (of the same type) or just the list it was created on.
Note: Once a field is defined as list specific or global it can not be changed. Global fields can not be created for an Opportunity type list.
When creating a column within a particular list (limited to Organization and People type), the option to set it as a Global Field will appear. They are indicated by the blue-colored text in the column title. Global columns are great because once created they may be leveraged on any similarly typed list you create.
Below is an example of a Global Field column created within an Organization's list:
If you view any organization's profile page, the field will appear:
A List Field column will only appear on the list in which it is created; indicated by black colored text. This is used so that data from one list does not affect other lists
Note: All columns created within Opportunity lists will be a List Field.
Below is an example of a List Field column created from within an Organization's list:
If you view any Organization's profile, you will not see this field appear: