In Grid Views, the first column is always a checkbox. Selecting one or more rows will launch the Batch Actions panel.
The number of selected rows displays at the top. When clicked, this opens the panel.
If you choose Select all rows, then all the rows that match your grid's filter will be selected—even if they are not visible on screen.
Each section will have unique batch actions, which are represented by icons below the count. Select an icon to view that action.