How to find current setting of "FORCE PARALLEL QUERY" in Oracle
Tested on 12.1 but should work if you have appropriate privileges in versions where this view and feature is available. you will see rows only if value is non-default. If query returns 0 rows, it means value is default. Please test and adjust view names for your environment.

Select name, value From Sys.V_$ses_Optimizer_Env 
Where Sid = (Select Distinct Sid From Sys.V_$mystat)
And Name In ('parallel_query_forced_dop','parallel_dml_forced_dop');