How to export portfolio summary page to Excel in the new UI?

In the old UI - in the lack of CSV/XLS export function - it was easy to copy/paste rows from the portfolio summary page to Excel. They pasted neatly by row. In the new UI (beta), this breaks because the paste results spends six rows per holding, uses merged cells, and leaves gaps between holdings (a blank row). This, of course, renders it unusable without configuring a workbook to reorganise the data and overcome the cumbersome formatting.

What’s the best way to get a neat, clean export in the new UI, please?