As shown in the video below, the Steam overlay is scaling incorrectly. Every part of the overlay UI is rendered in the wrong place, such that the mouse can't select it in the correct place. For instance, to access the browser window's rescale button, which is rendered in the centre of the screen, the mouse must be at the bottom-right.

It seems to me that every point is being drawn at ½ scale, starting from the top-left of the screen. Possibly, Steam is drawing the overlay using the display's native resolution (3024 × 1964) instead of the scaled resolution (1512 × 982 @ 2x) or otherwise confusing pixels with points. Please note: this bug ONLY happens when the game's resolution is set to the display's native resolution (3024 × 1964 or 3024 × 1890). When a game is set to the scaled resolution, the overlay works as expected (though the FPS counter is half the size).

https://www.youtube.com/watch?v=yV8NYS8Ek90


OS: macOS Sequoia 15.5
Steam Version: 1753318274