What you can pick up
You can drag an open tab, meaning any row in the Open Tabs list, in the side panel, the floating card, or the dashboard. You can also drag a Chrome tab group by its heading. Dropped on another window’s divider in the Open Tabs list, the whole group moves to that window. The drag label reads Moving with no copy hint, because a group only moves. See Chrome tab groups. You can also drag a saved tab, meaning any row in a workspace’s Tabs pane on the dashboard, and a saved link, meaning any row in a workspace’s Resources pane on the dashboard.Where you can drop it
In the card and side panel, Open Tabs and Workspaces are separate tabs, so an open tab and a workspace are never on screen together there. Dragging an open tab onto a workspace happens on the dashboard, where the Open Tabs list sits beside the sidebar. In the card and side panel, click the row’s Save to workspace button instead.Move is the default, hold a key to copy
Let go normally and the tab moves: it is saved into the workspace you dropped it on, and closed where it was. Hold ⌥ Option (Alt on Windows and Linux) as you let go and the tab is copied instead: saved into the workspace and left open where it was. You do not have to remember which one you are getting, because it is written on screen while you drag.The label that follows your cursor
From the moment you pick a tab up, a small card follows your cursor. The top line is the page you are carrying. The line underneath tells you exactly what letting go right now would do:Moving 1 tab to Marchmont Cafe — hold ⌥ Option to copyPress the key mid-drag and it changes as you watch:
Copying 1 tab to Marchmont Cafe — release ⌥ Option to moveIt names the workspace you are hovering, counts what you are carrying, and always spells the key the way your own keyboard does: ⌥ Option on a Mac, Alt on Windows and Linux.
If you would rather copy every time
If you want dragging an open tab to keep it open by default, turn on Settings → Open Tabs view → Keep the original tab open when dragging to a workspace. The modifier then does the opposite, so you hold ⌥ Option (Alt) to move. The label on the card always tells you which way round you are, whichever way you have set it. This setting is about open browser tabs only. Dragging a saved tab or a saved link is unaffected.Undo
Every drop can be taken back. When a drop lands, a message appears in the corner, “Moved 1 tab to Marchmont Cafe.”, with an Undo button and the undo shortcut beside it. You have ten seconds, and two ways to use them: click Undo, or press ⌘Z (Ctrl+Z on Windows and Linux).The keyboard shortcut only works while the message is on screen, and it never takes ⌘Z away from a text box. If you are typing in a rename field or the search box, ⌘Z undoes your typing, as it should.