base and outpout

I have a 1366x768 monitor, I usually stream with both 1920x1080 but i not watch my own stream to get any idea what is different if I set it beyond my monitor res. Now I want to set Base Res back to 1366x768 but Output Res is 1664x963 or 1080p can it upsacle stream quality or not? I can't find...

I have a big problem for a lot of time here with obs as well as other streaming programs the same one. Every time i stream i see black bars left and right of my scream in trovo or twitch. My monitor size is 1920x1080p so i set the base and output resolotion both to 1920x1080p so that must have...