I'm not sure if anything has changed since January of 2022, but I can't use the control key on my Windows device to select large chunks of emails to delete in the Canvas Inbox. However, on my Windows device with Chrome browser, a method which worked for me was...
- Click/select the top email's check box
- Scroll down to the bottom email displayed
- Press the Shift Key and click/select the bottom email in the list
- Then, delete those selected emails and repeat that process for the rest
So, for me it wasn't Control & clicking but Shift &clicking which worked to select large chunks of emails. I hope this helps!