Window Corners

Rounds browser windows to 26 points, like apps with a toolbar on macOS 26, or to any radius you pick down to square, instead of the smaller corners Dia's windows get. The page's corners that meet the window's grow with them so the gap around the page stays even, while the ones by the sidebar keep Dia's size. The sidebar that floats over the page when it's hidden, the pinned tabs and buttons in the window's corners, and the toolbar buttons in the page's top corners, like Chat, round to match. Toolbar buttons only round the corner they share.

Tabs in the sidebar	Tabs at the top

Turn it on

Open Dia → Settings → Patches and switch on Window Corners. Or run:

diatweaks enable windowCorners

Options

On the same page, once it's on:

• Radius: a slider from 0 to 26 points, 26 to begin with. 26 matches macOS 26 and 10 matches macOS 11 to 15. The page's corners follow, and with Edge-to-Edge Web Pages a square window has a square page. 0 is a 1 point radius, the smallest macOS draws.

FAQ

Does it work with tabs at the top?

Yes. With Hide Window Controls on, the pinned tabs sit in the corner and round to match it.

Does it work with Edge-to-Edge Web Pages?

Yes. The page reaches the window's edge with the same corners as the window.