You've activated the 'DDM Pinned to Active Window' feature for Windows 10. Disable it.
- Look for the small DDM icon that is pinned to your active application window.
- Click that icon.
- Find and click the function labeled 'Pinned to Active Window' or similar (it may be represented by a pin icon). This should toggle the feature off.
If that didn't work: The pinned menu can also be launched with the keyboard shortcut Ctrl+Shift+Ins within a running application. Pressing this shortcut again while the menu is active might dismiss it. Alternatively, try closing and reopening the application it's pinned to.
Heads up: This feature is designed for quick access to DDM functions like moving windows between Easy Arrange cells or sending an application window to a previous/next monitor directly from your active window.