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Theory:

The following is a list of shortcut keys for LibreOffice Impress.
 
Shortcut Keys
Effect
\(Arrow\)
Move the chosen object or the page view in the direction of the
arrow.
\(Ctrl+Arrow\)
Move the slide in the normal view.
\(Shift+drag\)
Constrain the movement of the selected object horizontally or
vertically.
\(Ctrl+drag\)
Hold down Ctrl and drag an object to create a copy of the object.
\(Alt+drag\)
Hold down Alt to draw or resize objects by dragging from the centre
of the object outward.
\(Alt+click\)
Select the object behind the currently selected object.
\(Alt+Shift+click\)
Select the object in front of the currently selected object.
\(Shift+click\)
Select adjacent items or a text passage. Click at the start of a
selection, move to the end of the selection and then hold down Shift
while you click.
\(Shift+drag\)
Hold down Shift while dragging to resize an object to maintain the
proportions of the object.
\(Tab\)
Select objects in the order in which they were created.
\(Shift+Tab\)
Select objects in the reverse order in which they were created.
\(Esc\)
Exit current mode.
\(Enter\)
Activate a place-holder object in a new presentation (only if the frame
is selected).
\(Ctrl+Enter\)
Move to the following text object on the slide. If there are no text objects
on the slide, or if you reached the last text object, a new slide is
inserted after the current slide. The new slide uses the same layout
as the current slide.
\(Page Up\)
Switch to the previous slide. No function on the first slide.
\(Page Down\)
Switch to the next slide. No function on the last slide.
 
Navigating with the Keyboard in Slide Sorter:
  
Shortcut Keys
Effect
Escape 
Sets the focus to the first slide.
Right Arrow
Moves the focus to the next slide.
Left Arrow
Moves the focus to the previous slide.
Spacebar
Makes the slide with the focus the current slide
Reference:
https://documentation.libreoffice.org/assets/Uploads/Documentation/en/IG4.2/PDF/IG4212-KeyboardShortcuts.pdf