To hide (close) all tabs, please press the toolbar button once. Next time, when you click on the toolbar button again, all hidden tabs are restored to the previous state (session). To adjust the settings (i.e., show a blank hide tabs page, show badge icon text, etc.), please visit the options page and mark the desired item(s). Moreover, to hide and restore tabs, you can use the keyboard shortcut (Alt+Shift+A) instead of the toolbar button.
