how do i close open websites

See the following from Use tabs in Safari on iPhone - Apple Support

Tap  to view all your open tabs. Then do any of the following:

• Close a tab: Tap  in the upper-left corner, or swipe left on the tab.

On Safari you click the right bottom button, two squares one on top of another (meaning several tabs), you'll be prompted with a multi tab organizer, just find the one you want to close and drag it to the left. Gone.

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