It’s easy to get bogged down in a cascade of Finder windows as you work with files, especially moving files between folders within Finder.
Finder Tabs help bring a less cluttered approach to Finder, and work in a similar way to tabs in your web browser. New Finder windows will open as tabs within a single Finder window.
You can click on a tab to see the contents of that window, and drag files from one tabbed view to another. Tabs can be clicked on and dragged to rearrange their order.
How to use tabs in Finder
To activate Finder Tabs, click Finder > Preferences and then click General. Tick next to open folders in tabs instead of new windows and close the Preferences window.
From here on, hold Cmd whenever you double-click a folder to open it as a tabbed folder. Close tabbed windows by clicking the X on the tab.