If you are changing contents within a script, a pop-up asking you if the changes made in the playtest should be applied, when you stop the playtest.
If its instances, the studio will not ask you if you want to keep the changes made in the playtest. However, we can copy instances from the playtest (using the explorer during playtest), and then paste them into the workspace after the playtest, but this is not truly applying changes from the playtest into the workspace.