First you must go to the far right of the search bar until you hit ‘the hamburger button’ or the triple bar button and click on it.

Then go to ‘History and Recent tabs’

Choose the tab that you would like to reopen. It will reopen in a new window.

If you happened to close multiple tabs at once, then go for the option that just says ‘x’-tabs and it will open in a new window all the closed tabs.