Two ways that Order Management licenses can be assigned are:
By Permission Set. A Permission Set is a collection of settings andpermissions that give users access to various tools and functions in Salesforce. A Permission Set can be assigned to individual users or groups of users, regardless of their profile or role. An administrator can create a Permission Set that includes the Order Management User permission, which enables users to access Order Management features and data. The administrator can then assign this Permission Set to the users who need Order Management licenses.
By User. A User is a record that represents a person who can log in and access Salesforce. A User has various fields and settings that determine their access and permissions in Salesforce, such as profile, role, license type, etc. An administrator can assign an Order Management license to a user by editing theuser record and selecting Order Management User from the License Type picklist. The administrator can also enable the Order Management User permission on the user record.
Verified Reference: https://help.salesforce.com/s/articleView?id=sf.order_management_user_permission.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.users_understanding_license_types.htm&type=5

Two reasons that could cause the issue of not being able to deploy a Change Set from a development org to a test org are:
The development org has not been approved to upload Change Sets from within the test org. To deploy ChangeSets between two sandbox orgs, the administrator needs to establish a deployment connection between them. A deployment connection allows one org to send outbound Change Sets and another org to receive inbound Change Sets. The administrator can create a deployment connection request from the development org and approve it from the test org.
The development org and test org are not associated with the same production org. To deploy Change Sets between two sandbox orgs, they must be linked to the same production org. A production org is an org that contains live data and business processes. A sandbox org is a copy of a production org that is used for development, testing, or training purposes. Sandbox orgs inherit the deployment connections of their source production orgs. Reference: Deploy Using Change Sets, Deploy a Change Set

The bestway for the administrator to satisfy this requirement is to edit the Lightning Record Page and change the Template to Three Regions. A Lightning Record Page is a type of page that displays details and related information about a specific record in Lightning Experience or Salesforce mobile app. A Lightning Record Page can be customized using the Lightning App Builder, which is a tool that allows administrators to drag and drop components onto a page layout. A Template is a predefined layout that determines how components are arranged on a page. A Three Regions template is a type of template that divides the page into three columns or regions. The administrator can edit the Lightning Record Page for the Order Summary object, and change the Template to Three Regions in the Lightning App Builder. Verified Reference: https://help.salesforce.com/s/articleView?id=sf.lightning_app_builder_customize_lex_pages.htm&type=5https://help.salesforce.com/s/articleView?id=sf.lightning_app_builder_templates.htm&type=5