https://docs.servicenow.com/bundle/tokyo-application-development/page/build/guided-app-creator/concept/guided-app-creator.html

The Allow configuration Application Access option determines whether users can configure the application tables, such as adding or modifying fields, views, or indexes. The following is true for a table with the Allow configuration option selected:
Out of scope applications can create Business Rules for the table. This is true because the Allow configuration option grants access to the table configuration to any user who has the admin or personalize_dictionary role, regardless of the application scope. This means that users can create Business Rules, which are server-side scripts that run when a record is displayed, inserted, updated, or deleted, for the table from any application.
The following are not true for a table with the Allow configuration option selected:
Only the in scope application's scripts can create Business Rules for the table. This is false because the Allow configuration option does not restrict the creation of Business Rules to the in scope application, as explained above.
Any user with the application's user role can modify the application's scripts. This is false because the Allow configuration option does not grant access to the application scripts, such as client scripts or script includes, to any user who has the application's user role. To modify the application scripts, users need to have the admin role or the application's admin role.
Out of scope applications can add new tables to the scoped application. This is false because the Allow configuration option does not allow out of scope applications to add new tables to the scoped application. To add new tables to a scoped application, users need to have the admin role or the application's admin role and be in the application scope. Reference: Application Access, Business Rules

When creating a table, the Create module field allows you to automatically create a module for the table in the application menu. The default behavior of the new module is to display a list of all records from the table. This can be changed later by editing the module properties and specifying a different link type, such as form, URL, or script.
Reference:
Create a table
Module properties

Configuring the label of a field in a child table changes the label only on that table, not on the base table or the parent table. The base table is the table that contains the common fields for all the extended tables, and the parent table is the table that is directly extended by the child table. The label of a field on the base table or the parent table can be different from the label on the child table. Reference: [ServiceNow Docs - Table extension], [ServiceNow Community - How to change field label in child table]

https://docs.servicenow.com/bundle/tokyo-application-development/page/app-store/dev_portal/API_reference/glideSystemScoped/concept/c_GlideSystemScopedAPI.html