Use Borderless or Windowed mode for Kaption

Exclusive fullscreen hands the entire screen to one game and skips the Windows desktop compositor. That compositor is what every Windows overlay rides on — Discord call popups, Steam overlay, Xbox Game Bar, and Kaption all draw through it. With no compositor in the loop, the overlay either flickers as Windows context-switches between the game and the desktop, or disappears entirely until you alt-tab.

This is a Windows behaviour, not a bug in Kaption. There is no way for a normal desktop app to draw stable pixels over an exclusive-fullscreen swap chain without injecting code into the game process — and we deliberately do not do that, because the whole point of Kaption is staying outside the game.

In Genshin Impact, open Settings → Graphics → Display Mode and pick "Borderless Window" or "Windowed". Apply the change and the game keeps running. You can also press Alt+Enter from the game window in most cases — it toggles between fullscreen and the last windowed mode.

Star Rail uses the same convention. Open Settings → Graphics → Display Mode and choose Borderless Window. Alt+Enter also works at any time. If the option is greyed out, leave to the title screen first and try again — some patches lock the mode mid-mission.

Borderless mode can shift the dialogue box by a few pixels compared to exclusive fullscreen. If your existing capture region was set up before switching, redraw it once. After that, the region is saved per game and you can keep playing.

A small number of overlays — Discord, Steam, MSI Afterburner — do work in exclusive fullscreen. They achieve that by injecting a DLL into the game process and hooking its DirectX swap chain. That approach is exactly what HoYoverse anti-cheat systems are built to flag, and Kaption has a strict no-injection policy: no DLL hooks, no game memory reads, no process attach. Borderless mode is the safe path that keeps Kaption outside the game.