How to use Variable Replication in Blueprint?

In blueprint scripts looks like down image

The Setting of Actor’s Replication is replicates and variable NarrowArea’s Replication is replicated.

In Authoirty(server) i want change variable named NarrowArea set false to true.

but in client NarrowArea alaways false.

i think that variable not changed in client.

I want user variable change in server, and use that changed variable in client to set actor.

How can i use it?