You would use the Project Explorer in SAP Business Application Studio to view the logical components of an SAP project. The Project Explorer displays application components in a logical view, which simplifies browsing of the contents of your application. It gives you a bird’s-eye view of the components involved in your application at any point in time. You can see the data models, services, UI front ends, and external resources of your project, as well as the connections and dependencies between them. You can also use the Project Explorer to open the relevant files for editing or previewing your application1

References: 1: Project Explorer | SAP Help Portal

The number in the attached graphic signifies the number of pending local changes. This means that there are 2 changes that have been made to the project files in the local repository, but have not been committed or synchronized to the remote repository. You can see the list of pending changes in the PENDING CHANGES section of the Simplified Git view in SAP Business Application Studio. You can also perform actions such as discarding, ignoring, or committing the changes from this section12

References: 1: Using the Simplified Git View | SAP Help Portal 2: Product Updates for SAP Business Application Studio 2303

The correct way for an application developed on SAP Business Application Studio to use data directly from a back-end system is to consume an external data service. This can be done by using the Service Center in SAP Business Application Studio, which simplifies the connectivity to external data sources, enables data source exploration from different providers, and integrates the data source into the application in development. For example, you can consume an external service from SAP S/4HANA by adding the Business Partner API to your application and adding the Business Partner entity to your application service. References:

• Connect to External Data Sources with SAP Business Application Studio
• Consuming an External Service From SAP S/4HANA - SAP Learning