Add -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8085 to Worker's JVM arguments in Configuration > Setup > Worker. Make sure that the specified TCP port is not used by any other program.

Restart Worker.

In Designer, open the debug configuration: Run > Debug Configurations.... In the left pane, right click the Remote Java Application item and select New.

Enter host and port (8085).

Click Apply.

Run the graph with Run > Debug.

The graph will run and stop on a breakpoint in the same way as in a Local project.