Trash folder is on iPad, not on desktop for the same account

Hello,

On my iPhone Gmail, there are the folders Trash & Junk. On the same Gmail account on my desktop there are only the Bin & Spam folders. When I empty the Bin & Spam folders on the desktop, the iPhone Trash & Junk folders still have lots of unwanted messages left in them. I tried to find both Trash and Junk on the desktop "Gmail settings" under System labels, but they are not available to view/ hide. I would like to empty both the Trash & Junk folders on the desktop with the "delete all messages" function instead of clicking away one by one one the iPad.