Genshin Impact pro tech tip!
Run GI in fullscreen borderless!
1. Find your shortcut to GI, it will probably reference "launcher.exe"
2. Open the containing folder and browse for the "GenshinImpactGame" directory
3. Inside will be "GenshinImpact.exe". Create a shortcut and add the `-popupwindow` argument to the path
4. Launch the game using this shortcut and press Alt+Enter
(Yes, this is usually the Restore command, but instead of restoring the window it will switch to fullscreen borderless mode)