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Close tabs in Safari on Mac
When you’re surfing the web or researching a subject, you can avoid cluttering your window with multiple tabs.
In the Safari app 
on your Mac, do any of the following:
Close a tab: Place the pointer over the tab in the tab bar, then click the Close button
on the left side of the tab.Close all other tabs: Control-click the tab you want to keep open, then choose Close Other Tabs.
Close all tabs to the right: Control-click a tab, then choose Close Tabs to the Right.
If you click a link that opens a new tab, you can close the tab by clicking the Back button 
.