This tutorial explains how you can insert ClipArts in LibreOffice/OpenOffice Impress.
ClipArt is a type of image file, mostly vector images which are pre-made to illustrate any subject/situation. When preparing any presentation for quick work, one tends to search in Google and find out images and eventually inserting them in Impress.
However, LibreOffice/OpenOffice itself brings a set of small graphics or ClipArts which you can quickly insert to make your presentation look professional for your work or school.
This is how you can do it.
How to Insert ClipArt in LibreOffice, OpenOffice
Open Impress and from the menu, click
Insert -> Media -> Gallery.
This would open up the Gallery window in the right sidebar. There are 12 categories of ClipArt is present today (as of the latest version). Which is I feel sufficient for basic or advanced usage.
To insert, simply click on a ClipArt and drag it to the presentation slide. And you would have your ClipArt inside the Impress slide.
This is how you can insert ClipArt images in LibreOffice, OpenOffice Impress slides quickly.