Hello, Roger.
Thank you for visiting Apple Support Communities.
I understand that you want to make adjustments to the Finder on your Mac. I am not sure if you are wanting to remove items from the Toolbar in Finder or you need to close open Finder Tabs. However, here are the two articles that cover both scenarios.
Hide or show the toolbar: Choose View > Hide Toolbar, or View > Show Toolbar.
Hiding the toolbar also hides the sidebar, and moves the status bar from the bottom to the top of the window.
Resize the toolbar: If you see angle brackets
at the right end of the toolbar, it means the window is too small to show all of the toolbar items. Enlarge the window or click the brackets to see the rest of the items.
Change what’s in the toolbar: Choose View > Customize Toolbar. You can drag items into and out of the toolbar, add a space between items, and choose whether to show text with the icons.
Rearrange the items in the toolbar: Hold down the Command key, then drag an item to a new location.
Add a file or app: Hold down the Command key, then drag the item to the Finder toolbar until a green plus sign (+) appears.
Remove an item: Hold down the Command key, then drag the item out of the toolbar.
OS X El Capitan: Customize the Finder toolbar and sidebar
OS X El Capitan: Open folders in new Finder tabs or windows
Cheers