nope, just needed to do only background

extra/niri.kdl

@@ -165,7 +165,6 @@ window-rule {
 window-rule {
   match app-id=r#"^kitty$"#
   draw-border-with-background false
-  opacity 0.7
 }
 
 // Example: block out two password managers from screen capture.

modules/applications/kitty.nix

@@ -17,6 +17,7 @@ in
       settings = {
         confirm_os_window_close = 0;
         scrollback_lines = 5000;
+        background_opacity = 0.2;
       };
       shellIntegration = {
         enableZshIntegration = true;