If an Apsona List View merge button processes only a single selected record instead of all selected records, the issue is typically related to the Salesforce components that support List View merges rather than the merge action itself.
First, ensure that the custom button has been created specifically as a List View button and is placed on the object's List View. If the button is configured correctly, verify that the required Salesforce components are available.
Navigate to Setup → Process Automation → Flows and confirm that the Apsona List View Button Merge Flow exists. Also, navigate to Setup → Custom Code → Lightning Components and verify that the apsonaListViewButtonMerge Lightning Web Component (LWC) is present. Both components are required for List View merge functionality.
If the Apsona List View Button Merge Flow is missing, upgrade the Apsona for Salesforce (AFS) package to the latest version, which installs the required flow.
If the flow exists but is not active, activate it by following these steps:
Go to Setup → Process Automation → Flows.
Search for Apsona List View Button Merge Flow.
Click the drop-down arrow next to the flow and select View Details and Versions.
Verify that Version 2 is available.
Click Activate to make Version 2 the active version.
Once the flow is installed and activated, the List View merge button will process all selected records as expected.
When troubleshooting a List View merge button that processes only one record, always verify the presence and activation of the Apsona List View Button Merge Flow and the apsonaListViewButtonMerge Lightning Web Component before investigating the merge configuration itself.