The Stacks Feature
Starting with macOS Mojave, Apple introduced a feature called “Desktop Stacks” designed to help users who treat their desktop as a dumping ground for files. When Stacks is enabled, macOS automatically groups files on your desktop into neat little piles based on their file type (e.g., all images in one stack, all PDFs in another) or by specific tags. While this keeps the desktop looking incredibly tidy, it can be extremely frustrating if you have deliberately placed a specific screenshot in the top right corner and a specific document in the bottom left corner for quick access. Stacks overrides your manual spatial organization and hides your files inside expandable icons.
Restoring Manual File Placement
To retain full control over where your icons live and stop macOS from automatically organizing your desktop files into Stacks, you must disable the feature via the desktop context menu.
Navigate to your Mac’s desktop (ensure Finder is the active application). Right-click (or Control-click) on any empty, blank space on the desktop wallpaper. A context menu will appear. Look for the option labeled Use Stacks. If Stacks is currently active, this option will have a checkmark next to it. Click on Use Stacks to toggle it off. The checkmark will disappear, the Stacks will immediately dissolve, and all your files will scatter back across the desktop to their original, individual positions. If you find your icons are still snapping to a rigid grid when you try to move them, right-click the desktop again, select Sort By, and choose None, which will allow for completely free-form icon placement.