Based on the context of customizing Windows to act like Mac OS, creating a "solid piece" (likely a consolidated, single-pane navigation experience) using a tool similar to "Finder Windows 1.5.11" usually refers to using a file manager like to achieve a Mac-like column view.

For a truly "solid piece" experience, you can also use Command-X to cut and Command-V to paste, which, when used within a file manager, mimics the Mac behavior of immediately removing the file from the original location during a move operation.

to a specific Mac OS look (e.g., Monterey, Sonoma)? Setting up keyboard shortcuts for file actions? Configuring the column view for faster file browsing?