Photoshop 28.0: Layer panel popup menus malfunction at display boundary in mixed-DPI multi-monitor setup (macOS)

Title: Photoshop 28.0: Layer panel popup menus malfunction at display boundary in mixed-DPI multi-monitor setup (macOS)

Environment

• Adobe Photoshop 2027 (28.0)

• macOS, Mac Studio (Apple Silicon)

• Three-monitor setup:

  • Left: 2560×1440, native resolution

  • Center: 2560×1440, native resolution

  • Right: 3840×2160, scaled to 2560×1440

Issue

When the Layers panel is docked at the right edge of the center monitor, popup menus such as Layer Style (fx) and Create New Fill or Adjustment Layer immediately disappear or behave incorrectly.

Sometimes clicking the fx button unexpectedly activates Drop Shadow, the last item in the menu.

Reproduction and test results

1. Dock the Layers panel at the right edge of the center WQHD display. The issue occurs.

2. Move the panel away from the right edge. Menus work normally.

3. Move the panel to the left edge of the center display. Menus work normally.

4. Move the panel to the right 4K display. Menus work normally.

5. Change the macOS display arrangement so the 4K display is positioned to the left. The issue disappears.

6. Restore the original display arrangement. The issue returns.

7. Keep the original arrangement but change the right 4K monitor to native 3840×2160 resolution. The issue disappears.

Expected behavior

Popup menus should open and remain usable regardless of monitor arrangement, scaling, or panel position.

Observed behavior

Popup menus malfunction specifically when the Layers panel is docked at the center monitor's right edge, adjacent to a 4K monitor using scaled resolution.

Possible cause

A popup menu coordinate or display-boundary handling issue involving mixed display scaling on macOS.

The behavior is reproducible by changing the external monitor's display resolution or arrangement.