How to select all results in the left sidebar of the browser

Any idea how can select all results in this sidebar:

see yellow marked area.

I can not do it with Shift and click, cmd and click, or vie menu.

Any hint?

This is just to reinforce the same behaviour. It DOES NOT work for me now. It used to work with the shift key - just highlight the first item and scroll to the bottom - shift-click.

Works fine here with cmd>A or Shift click.

The sidebar doesn’t support multiple selections, only one result can be selected/viewed. But all results of the search window can be selected.