Move the mouse to the "My sfCRM" menu (no need to click there). A dropdown menu appears. Choose the "Menu Layout" option.

The Set menu preferences page appears. The positions of all the entities as they appear in the main entities bar is seen here. The My sfCRM item always appears at position 1. The number found in the box next to each item indicates the relative order of that item in the menu bar, with ties broken in favor of alphabetical order. For example, this screen shows that Tools has the largest number (16) associated with it, so it will be the rightmost tab at the top. Also, Opportunities and Products both have the number 4 associated with them, so they will appear in alphabetical order (Opportunities, then Products).

Similar reasoning applies to sub-menu items. The exact numbers you choose don't matter, it is only their relatve order that matters. In this example, My accounts will be the topmost submenu item in the Accounts menu.

Notice the box next to Campaigns has "Not Shown" next to it. This means that though there is an entity called Campaigns, it is not shown in the main entities menu bar.

Save the changes.

A dialog box appears, informing that changes will take effect on your next login. Click on OK and log out.

Login again and note that the changes are in effect. The "Tools" menu item, in particular is now the last item in the menu bar.