This parameter LRF_ARQ_MODE is for leave request wdabap application.
Based on this parameter values it will act for employee / managers.
In t-code SWFVISU, you just have to maintain the task parameters as shown below for TS21500003
APPLICATION hress_a_ptarq_leavreq_appl
DYNPARAM LRF_REQUEST_ID=${item.REQUESTID}.&WDCONFIGURATIONID=HRESS_AC_PTARQ_LEAVREQ&LRF_ARQ_MODE=A
NAMESPACE sap
SYSTEM_ALIAS SAP_ECC_HumanResources
And there is no table V_PTREQ_TEAM to alter this parameter value.