How to mount curtain rails so block-out curtains are closer to the wall?
Consider adding a small hook to the &quot;outside&quot; of the hanger bracket (the side facing the side wall in the image provided), then pulling the blackout curtain around the corner and hanging the last curtain hook on this new hook. That should pull the whole curtain around the corner and cut out a significant additional light leakage.
If that's still not sufficient, hang small panel straight down from the curtain rod support brackets. Light doesn't travel around corners very well, so these &quot;side blockers&quot; should also cut out a significant amount of light.
You may need to combine both options.