Yes, you have to manually close all the tabs that have opened. I suggest using keyboard shortcuts to make this easier: For example, I’m using a Mac and on Chrome and Firefox I can use Command + W to close a single tab or Shift + Command + W to close the window that is active.

Links to keyboard shortcuts for commonly used browsers:

Firefox: https://support.mozilla.org/en-US/kb/keyboard-shortcuts-perform-firefox-tasks-quickly

Chrome: https://support.google.com/chrome/answer/157179

Safari: https://support.apple.com/guide/safari/keyboard-and-other-shortcuts-cpsh003 (Has a "Close all tabs except for one” shortcut)

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