You don’t say what browser you are using, so I will take a wild guess, Avast Secure Browser (ASB) since you are on the Avast Community Forum.
I don’t use ASB but Firefox and have many tabs open and also pinned, Generally you can click the ‘X’ on the tab or use the
To close a tab on Chrome for Windows, press Ctrl + W on your keyboard; this will close the currently active tab
This is the same for Firefox and have many tabs open and also pinned, Generally you can click the ‘X’ on the tab or use the Ctrl + W function mentioned above.
It looks like this is a common key stroke function in multiple browsers. If you are using ASB, this is based on the Chromium code so I would take a wild guess it would also work for ASB.