It is possible to change an application's scope in ServiceNow, either from global to private or from private to global. However, changing the scope of an application may affect its functionality and compatibility with other applications. Therefore, it is recommended to test the application thoroughly before and after changing its scope.
How To Change Application Scope In ServiceNow - YouTube
How to move Custom Scoped Applications bettween instances - ServiceNow
Steps to switch a scoped application from your company's application repository to update sets - ServiceNow How to change the application (scope) of a SLA Definition without needing to recreate the SLA Definition - ServiceNow Advantages of Scoped Applications in ServiceNow - QualityClouds

In ServiceNow, UI Actions are elements that make the user interface more interactive and tailored to user activities. They can appear as buttons, links, or context menu items on forms and lists. The valid types of UI Actions include:
* C. Form choice: These are UI Actions that appear as choices in form context menus, allowing users to perform specific actions related to the form.
* D. Form button: These are buttons that appear on forms, enabling users to execute defined actions directly from the form view.
* E. List banner button: These are buttons that appear in the list view's banner, providing actions that can be performed on the list or selected records.
The other options are not standard UI Action types:
* A. Workflow action: While workflows can include actions, "Workflow action" is not a defined UI Action type in ServiceNow.
* B. Record navigation button: This is not a standard term used for UI Action types in ServiceNow.

https://developer.servicenow.com/dev.do#!/learn/learning-plans/tokyo/new_to_servicenow
/app_store_learnv2_automatingapps_tokyo_use_application_properties

The ServiceNow Store is a marketplace for free and paid certified ServiceNow applications and integrations.
The ServiceNow Store provides customers with access to Now Certified enterprise workflow apps from partners that complement and extend ServiceNow products and solutions. Customers can browse, try, buy, and deploy apps and integrations that suit their needs and enhance their ServiceNow experience. The ServiceNow Store is not the source for ServiceNow Community created developer content, as that is available on the Developer Portal or the Share site. The ServiceNow Store is not a downloadable content ServiceNow script archive, as that is available on the Script Library or the Script Repository. The ServiceNow Store is not an alternate name for the ServiceNow Developer Share site, as that is a separate site where developers can share applications, code snippets, UI pages, etc. Reference: ServiceNow Store

An example of when an application might not use a Scheduled Script Execution (Scheduled Job) is when the application needs to run a client-side script at the same time every day. A Scheduled Script Execution is a server-side script that runs on a specified schedule and performs some action on the server or database. A client-side script runs on the user's browser and cannot be scheduled by ServiceNow. The other options are examples of when an application might use a Scheduled Script Execution, such as sending email reminders, running a clean up script, or querying the database for unassigned records. Reference: Scheduled Script Execution, Client scripts