By "all running processes" are you referring specifically to SAS jobs running on an LSF Grid?
Flow Manager is a client application for Process Manager, the scheduling component of the grid. I'm not aware of any function in Flow Manager or Process Manager that would terminate all jobs. Their functions are specific to scheduled flows.
There is an LSF command "bkill" that will terminate a given job or all LSF jobs. Process Manager has a similar jkill command if we are talking only about scheduled flows.
https://www.ibm.com/docs/en/spectrum-lsf/10.1.0?topic=reference-bkillhttps://www.ibm.com/docs/en/slpm/10.2.0?topic=commands-jkill
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Greg Wootton | Principal Systems Technical Support Engineer