New Print Selection… command (CmdPrintSelection, selection context menu, command palette). With a rectangular (Ctrl + drag) selection, it opens the print dialog with Selection already chosen, so only that area prints (#6222).

The classic print dialog’s Use original page sizes option is now called Actual size (1:1). For a scan or image that doesn’t record its resolution, or records a wrong one, tell SumatraPDF the right one with the PrinterDefaults.PrintDpi setting or -print-settings "dpi=<n>", so Actual size (or noscale) prints it at its real size (#6223).