https://support.microsoft.com/en-us/office/keyboard-shortcuts-in-word-95ef89dd-7142-4b50-afb2-f762f663ceb2
To close a task pane using the keyboard:
The ribbon groups related options on tabs. For example, on the Home tab, the Font group includes the Font Color option. Press the Alt key to display the ribbon shortcuts, called Key Tips, as letters in small images next to the tabs and options as shown in the image below.
Note: Add-ins and other programs may add new tabs to the ribbon and may provide access keys for those tabs.
You can combine the Key Tips letters with the Alt key to make shortcuts called Access Keys for the ribbon options. For example, press Alt+H to open the Home tab, and Alt+Q to move to the Tell me or Search field. Press Alt again to see Key Tips for the options for the selected tab.
In Office 2013 and Office 2010, most of the old Alt key menu shortcuts still work, too. However, you need to know the full shortcut. For example, press Alt, and then press one of the old menu keys E (Edit), V (View), I (Insert), and so on. A notification pops up saying you're using an access key from an earlier version of Microsoft Office. If you know the entire key sequence, go ahead and use it. If you don't know the sequence, press Esc and use Key Tips instead.
To go directly to a tab on the ribbon, press one of the following access keys. Additional tabs may appear depending on your selection in the document.
Open the View tab to choose a document view or mode, such as Read Mode or Outline view. You can also set the zoom magnification and manage multiple document windows.
Work in the ribbon with the keyboard
In Word 2007 and 2010, you can browse the document by various types of objects, such as fields, footnotes, headings, and graphics.
Navigate the document using the browse options in Word 2007 and 2010