Minimized windows disappear into the Dock and you can't find them anywhere
You hit ⌘+M to minimize a window and it just... vanishes. There's no taskbar showing open windows like on Windows. It shrinks into a tiny thumbnail hiding at the far right of the Dock, which is easy to miss if you have a lot of Dock icons.
Why does this happen?
macOS doesn't have a Windows-style taskbar. Minimized windows live in the Dock to the right of the app separator line, shown as small window thumbnails. It's a fundamentally different paradigm that catches every Windows switcher off guard.
How to fix it
Look at the right side of the Dock (after the divider line) for small window thumbnails.
Click a thumbnail to restore that window.
Use ⌘+Tab to switch apps, then click the app in the Dock to show its windows.
Tip: System Settings → Desktop & Dock → enable Minimize windows into application icon to keep the Dock less cluttered.
Discussion
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