The New Overlay picker now marks any window or display you're already capturing with a green border, so spawning another copy is a deliberate choice rather than an accident. Duplicate captures are still allowed.
Added a setting to hide the 4K capture resolution (Settings → OVR → Overlays). With it off, the capture picker offers only 1K and 2K. Off by default.
Bug Fixes
Fixed capturing the same window or display more than once — for example spawning your primary display again — silently failing to open. You can now run multiple captures of the same source.