I find it absolutely mind-boggling that Microsoft implemented a multi select feature for data tables (preview) but did not implement a select all checkbox as well. This should be an extremely obvious feature to implement. Every table control in any coding language has had a select all option. How can Microsoft be so far behind in modernization?
From everything I've researched, there is no way to manually do this as the table's SelectedItems property is read-only. I can make a checkbox that adds every table item to a collection and then process it, but this still doesn't achieve being able to select/deselect every row in a data table.