Preview will dock on the right hand side of the MainWindow. Try dragging it to the Right hand side and hold it there and it should redock. Sometimes double-clicking on Preview's title bar can achieve the same thing.
Preview's state and location is stored in the Sigil preferences main ini file. Reinstalling of Sigil will not help as your Preferences are stored separately.
Last edited by KevinH; 09-25-2025 at 02:19 PM.
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