Once you've floated all the views out of the main window, no drop targets remain to bring them back. If you have "Save Default Layout On Exit" checked, and you exit, you'll appear to be stuck like this. For now, the workaround is to show the Session View and enter "restore-layout factory".
*** Bug 161390 has been marked as a duplicate of this bug. ***
Component is obsolete so resolving bugs as INCOMPLETE
Status: ASSIGNED → RESOLVED
Last Resolved: 4 months ago
Resolution: --- → INCOMPLETE
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