To select / deselect all rows on the list page:

1. Locate selection box - in the top left corner of the list - the box with + sign.

2. Click on it.

3. This action will switch the selection status of all rows on the current list page. The selected rows will become deselected and the rows that were deselected will be selected.

If you cannot locate the selection box, the list rows cannot be selected at all.