Can someone Help with Filtering Enabled?

As said by Kryddan, FilteringEnabled is a property of Workspace. All you do is check the box and your game will now be using FilteringEnabled.

However, I think you may not understand what it really does due to you not knowing how to turn it on. Filtering enable will cause you to script a game differently than what you would do without FilteringEnabled on (Also called FE).

• So, what does FE really do?

FE stops LocalScripts on everyone's client from replicating to the server. So an example given on the wiki is a player inserting a LocalScript that makes a dragon appear. That person who created the dragon will see it while no one else in the server will because the dragon never replicated to the server and back to another's client.

• How does this affect scripting?

Any LocalScript made in your game will most likely break because it cannot do anything that will affect others beside a persons client. So you would need to use RemoteEvents and RemoteFunctions to allow scripts to communicate between server and client (if needed).