Move a window to a different workspace
Using the mouse:
Open the Activities overview.
Click and drag the window toward the right of the screen.
The workspace selector will expand.
Drop the window onto an empty workspace. This workspace now contains the window you have dropped, and a new empty workspace appears at the bottom of the workspace selector.
Using the keyboard:
Select the window that you want to move (for example, using the Super+Tab window switcher).
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Press Super+Shift+Page Up to move the window to a workspace which is above the current workspace on the workspace selector.
Press Super+Shift+Page Down to move the window to a workspace which is below the current workspace on the workspace selector.