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VL PDF 0.3.48
Side by side is in the View menu now.
It was only under More. It is in the View menu too — the control that reads Fit width at the bottom right — under Layout and view, next to Two pages.
It carries a tick while the second document is open, and choosing it again closes the pane. Open the other PDF in a tab first: the picker offers the documents you already have open.
1,348 automated tests, 0 failures. 97 of 97 interface checks. Verified in the running build.