When the ProofreadPage Page: namespace editor is in its alternate layout (the one called "horizontal layout" which arranges the scan image and text editor vertically above one another. *sigh*), the "Extract text" widget is positioned incorrectly. It looks like it is positioned where it would have been if the editor had been in its default layout (the one called "vertical layout" that arranges the scan image and text editor horizontally side by side. *sigh*).

Example page to reproduce here. In the "Proofread tools" section of the toolbar, hit the "Vertical/horizontal layout" toggle (two black rectangles, one horizontal one vertical, with a bent arrow pointing from one to the other).

Screenshot showing the misplaced widget (lower right corner, -ish):