I'm not sure if this is technically a bug, but it is pseudo-application-breaking in terms of the user experience. What happens: if you have a dual monitor setup, with Unity fullscreen on one, and another program (ex. VS Code) fullscreen on the other monitor, you will never see any "picker" modals or dialog popups. They appear on a different workspace that is off the screen. If you don't realize this is happening, the application will appear to be frozen. What's interesting is that if you have Unity running in fullscreen on only a single monitor the modals show up just fine. So it appears to be unique to dual monitors. To reproduce: On a macbook, connect an external monitor. Open Unity on the external monitor, and VS Code on the macbook's built-in screen. Make both fullscreen. Now attempt any action that would spawn a modal within Unity. Possible solution(?): force any modals to appear on the same monitor as the program itself. Not sure if this is possible, or if a different solution may be required. Perhaps a "popover" style dialog that is "tied" to the relevant field in the inspector?