I don't think there's a direct way to force this but there is a workaround:
* Click on one of the disclosure triangles to the left of one of the page thumbnails. This will show the full width of the P&L gallery.
* Now click on the Locate button. This makes the P&L gallery always expand the tree to show the selected object.
The P&L gallery will now remain full width because it needs to show the expanded tree.
Phil
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