How to select a range of emails that can occupy many emails and on more than one page without clicking one by one on each of them, how to make use of the block selection by using the usual Ctrl+shift keys in other environments.
For Windows or Mac, you normally just click the first email subject (without holding any keys) and then scroll up or down to wherever you want to select to and then hold the shift key and click.
That then gives you the selection of emails.