The flow being debugged must be paused at a breakpoint.
To run to completion:
Switch to the Debug perspective.
In the Debug view, click the Run to completion icon on the
toolbar (or right-click the flow stack frame, then click Run
to completion). The flow instance ignores all
breakpoints while running to the end. The flow instance is automatically removed
from the Debug view.
Tip: If you want the flow to carry on running, but you
want to stop at the next breakpoint instead of running the flow to completion,
see Resuming flow instance execution.