I guess you wanted to change the settings of the audio files into "streaming"? You can shift-click and select all the audio files you want to stream and right-click and then choose Show in Multi Editor. In the Editor, you can set the properties whatever you want and it will change all the settings of those files (actually they are Sound-SFXs instead of "audio files") simultaneously. It is not recommended to use streaming in most situations. Only use them on music and long ambient sounds. Btw sometimes you can also create a parent actor-mixer of the sounds in the same folder and make some settings on it so that the child containers or SFXs inherit the settings of the actor-mixer, with "Override Parent" unchecked in the children. But this is not the case of streaming since you are not able to set Streaming in an actor-mixer.