Your first wallpaper

Open Morrowpane and choose Add Images, or drop JPEG, PNG, or HEIC files into a collection. Try Sample starts with three original generated nature images. Optimized copies are stored separately; your source files stay untouched.

Choose Masonry or Grid, then adjust columns, spacing, roundness, background, and an icon-safe band. In a narrow window, the layout button opens these controls in a sheet. Right-click an image for Move Earlier or Move Later; Command-Z undoes library changes.

Choose a display and inspect the preview. Apply Wallpaper changes the desktop; preview controls alone do not. Shuffle changes the arrangement and applies it. Settings → Displays can restore the previous wallpaper during the current app session, where macOS permits.

Choose Manual or a 15, 30, 60, or 120-minute schedule. Closing the library leaves the menu bar app running. Quitting stops automatic changes. Sleep and Low Power Mode pause changes.