White border appeared around screen

[pgian]

After building and running the app, a thick white border appeared around the entire screen and nothing was added to the menu bar.

MacBook Pro
Apple M1 chip
macOS 26.0.1 (25A363)

[celstark]

I think the icon does appear, but it's just in the "<" part, overflowing. I'm seeing it appear but getting the same behavior of it's adding a frame (for the corners) to the main desktop rather than to the app windows.

[gingerbeardman]

It's not working as expected, but @celstark

Visually square the rounded display corners in macOS 26 (Tahoe) and newer by drawing unobtrusive, click‑through overlay caps.

Note: This does not change the rounded corners of individual app windows. It only restores the straight silhouette at the edges of your display.

[celstark]

Right. I suppose what's odd is that for someone who works on an external monitor, there are no rounded edges on my display, only on the app windows.

[gingerbeardman]

Right, I think a better way to describe what this is trying to fill with a solid colour the gaps that the rounded app windows leave. To make them less noticable

[ershov]

Same issue. I have a dark theme and what I get is a black border around the screen.