Feature Suggestions

But this one is already exists... not from Streamlabs, but Overwolf has this function working really well! You can also set an opacity of window with chat (what you seeing in game even at fullscreen) and if this window is has to be streaming or OBS should ignore this window. Try it out! 

But of course i'd love to have this feature official from streamlabs

get a second screen? .-.

i use restream chat but if it was all in one place i wouldnt need to 

Overwolf don't work with the game I'm playing and streaming and the mobile app don't alert me of subscribers or redeemed rewards

This is one problem I have as I only have one monitor and only want to use one app to see the chat while in fullscreen. I really hope it is implemented into streamlabs.

I just realized it says will not implement

xSplit GameCaster has this feature. It's free.

Open your game first. Then open GameCaster. (Doing so in this order makes it invisible on the stream but visible to you. This way it doesn't interfere with your actual alerts that appear). 
Press CTRL + Tab to open the menu. you can set the opacity of everything as well.  You don't have to stream with this software just use it for the chat & alerts. however I don't believe it will show your donation alerts since it's not donated through twitch but through StreamLabs. It uses the Twitch api to capture: Chat, follower, subscribers, viewers & viewer count. You can also set your game & title as well.