Why don't I see all the fields in the Documents tab of the form?

For example, in the example screenshot we have 56 fields.

However, in the documents tab, as columns, it only shows 11.

What is happening is that your fields are not enabled as searchable. From the field configuration, you can activate the option.

IMPORTANT!
Activating all fields will have an effect on the loading times of this screen.
loading times of this screen.
We recommend that you activate only those that are frequently used.