Writing side by side document - bilingual agreement

Pages will not split row content across page boundaries as would Microsoft Word or LibreOffice Writer. It splits on row boundaries, and as you have used one row for the entire page, it will be stuck at the bottom of the page.

Then, there is the Text box solution where one duplicates two full-page adjacent Text boxes across multiple pages, intending to downward link the left and right Text boxes to keep the languages separate. One can do this, but the second Text box on the first page will always want to be 2⃝ and receive the overflow from the first Text box.

One avoids this by clicking on that second Text box and choosing Remove from Thread. It then becomes a red 1⃝ and when you click each Text box on the second page, each becomes the 2⃝ of its Text box alignment and color. That allows your language to flow across the page boundary into its corresponding vertical counterpart Text box for as many pages as you need. The Text boxes can be grouped for duplication purposes across page boundaries, but one cannot apply Text box linking to grouped Text boxes.

Link text boxes in Pages on Mac - Apple Support

Tested: Pages v14.3, Sequoia v15.3.2

The default Arrange panel settings for table content to automatically flow to the next page are these:

Note that Pages, unlike Microsoft Word or LibreOffice Writer, will not split row content across pages, but on the row boundary.