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Theory:

You can use LibreOffice without needing a pointing device, such as a mouse or trackball, by using its in-built keyboard shortcuts. The diverse and complex tasks such as docking and un-docking toolbars and windows or adjusting the size or location of objects can all be performed with only a keyboard. Although LibreOffice has its own large set of keyboard shortcuts, each component of shortcuts provides others that are specific to its work.
 
Impress Function Keys:
 
A function key is a key on a keyboard which can be programmed so as to cause an operating system's (OScommand interpreter or application program to perform certain actions, a form of a soft key.
 
750px-ISO_keyboard_(105)_QWERTY_UK.svg.png
 
Shortcut Keys
Effect
\(F1\)
Open LibreOffice Impress Help.
\(F2\)
Select the text tool and edit the text.
\(Ctrl+F2\)
Starts slide show.
\(F3\)
Enter group and edit group.
\(Shift+F3\)
Duplicate object.
\(Ctrl+F3\)
Exit group.
\(F4\)
Open Position and Size dialog.
\(F5\)
Starts slide show.
\(Shift+F5\)
Restart a slide show at the current slide where the slide show was
previously stopped at.
\(Alt+Shift+F5\)
Go to the first slide in a presentation when in Normal view.
\(Ctrl+Shift+F5\)
Open Navigator.
\(F6\)
Forward navigation within the on-screen elements without using
mouse.
\(Shift+F6\)
Backward navigation within the on-screen elements without using
mouse.
\(F7\)
Start spelling checker.
\(Ctrl+F7\)
Open thesaurus.
\(F8\)
Edit points.
\(Ctrl+Shift+F8\)
Fit text to frame.
\(Shift+F10\)
Open context menu of a selected object.
\(F11\)
Open Styles and Formatting dialog.
Reference:
https://documentation.libreoffice.org/assets/Uploads/Documentation/en/IG4.2/PDF/IG4212-KeyboardShortcuts.pdf
Image credit:
https://commons.wikimedia.org/wiki/File:ISO_keyboard_(105)_QWERTY_UK.svg