Hold down the right mouse button and draw an L shape to close the active tab.
To close a tab, hold down the right mouse button and swipe down and right, making an L shape.
Keep doing that to close multiple tabs one after another. It’s a great and fast option, when you want to see what’s on the page before closing it.
In case you accidentally closed a tab or changed your mind, you can reopen recently closed tabs by holding down the right mouse button and swiping up and right.
You can discover more gestures and customize them in Settings > Mouse > Gesture Mapping.