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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. Tasks as diverse and complex 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 provides others that are specific to its work.

Impress Function Keys:

A function key is a key on a keyboard that can be programmed to cause an operating system (OS) command interpreter or application program to perform specific actions, a form of a soft key.

 Shortcut Keys Effect $$F1$$ Open LibreOffice Impress Help. $$F2$$ Select the text tool and edit the text. $$Ctrl+F2$$ Starts a slide show. $$F3$$ Enter group and edit group. $$Shift+F3$$ Duplicate object. $$Ctrl+F3$$ Exit group. $$F4$$ Open Position and Size dialogue. $$F5$$ Starts a slide show. $$Shift+F5$$ Restart a slide show at the current slide where the slide show waspreviously 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 usingmouse. $$Shift+F6$$ Backward navigation within the on-screen elements without usingmouse. $$F7$$ 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://commons.wikimedia.org/wiki/File:ISO_keyboard_(105)_QWERTY_UK.svg