Settings for quantity of classes appearing wrongly when field type is different of multiple class fields

Problem/Motivation

The field to set the quantity of classes per block is appearing when the field type is textfield or textarea, but it's wrong because this one will be used only with multiple items

Steps to reproduce

Go to settings page
Set field type = multi items
Set the field qty_classes_per_block = 10
Save
Open the settings page again
Update the field type to fieldset or textarea
Take a look on field "Quantity of classes per block"
Result: This field continue appering wrongly
Expected: This field shoul appear only for fieldtype = "Multiple items" because is the only used

Proposed resolution

We can implement a Drupal Form States API to remove this field when isn't necessary https://www.drupal.org/docs/drupal-apis/form-api/conditional-form-fields

Remaining tasks

User interface changes

API changes

Data model changes