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ChenPM

App Store https://apps.apple.com/us/app/deskwidgets-desktop-widgets/id6446226257?mt=12

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Reply to Custom NSWindow styleMask behavior changed/broken resulting in unresizable or non-responsive windows in macOS Tahoe 26.3 RC

We are also affected by this issue. All borderless windows are no longer clickable or movable in macOS 26.3 RC. This behavior was working normally in 26.3 Beta.

UI Frameworks AppKit

Feb ’26

Reply to Custom NSWindow styleMask behavior changed/broken resulting in unresizable or non-responsive windows in macOS Tahoe 26.3 RC

We are also affected by this issue. All borderless windows are no longer clickable or movable in macOS 26.3 RC. This behavior was working normally in 26.3 Beta.

UI Frameworks AppKit

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Activity: Feb ’26