Answer / herold_f

Found on the web :

"When creating function groups, realize that when a program
(client) calls a function module, the function group and all
its global data are instantiated and consume runtime memory
until the end of the calling program (client lifetime). Do
not overload your function group as it may result in
effecting the performance of the calling program."

-> Memory is not released before the end of the calling program.

Answer / niladriroy_dgp

when func module completed then after exporting the value
or tables by func module ABAP memory will release.

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