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Portals on a layout (same portal) can be set to specify the START record number and the NUMBER of records (rows) that show in the portal.
Just look closely at the Portal Setup for these values. This is not a filter, but the hard-coded values. Set the first one to start at 1 and show 10 records, for example. And the second portal would start as 11 and show the 20 records (with scroll bar).
As I may not be assured of only so many, I'll place a scroll bar on the last portal just in case.