Case-ID: 18156962. Thanks.

DTS request ID：102812035051 Thanks.

Thank you for your attention. I should describe my issue more accurately. The anomaly I've discovered is that the system's automatic input method switching auxiliary view (UICursorAccessoryView, as shown in the image I added in the comments) does not appear. When using a standard UITextField instance, this view displays correctly near the cursor during input method switching. However, when I use my custom UIResponder subclass, it remains invisible in the same scenario.

I have found the cause of the problem. If the movable flag in NSWindow is set to NO, it will cause this feature to be unusable.

Thank you for your reply! I am a Qt developer. I found that there is no access to this feature in titleBar(In the maximized hover panel, there is only a full-screen option) and menuBar(In the view submenu, there is no corresponding feature menu item, which appears to differ from the automatic addition rules for the dictation function and emoji symbols in the edit submenu.). I hope to support this capability.