What is the Gallery?
The Gallery is a library containing objects (pictures or sounds) that can be easily inserted in your documents. It is available in all modules of LibreOffice.
To open the Gallery, click on tab Gallery of the sidebar.
Objects of the Gallery are gathered by themes, such as backgrounds, bullets, etc. You can create as many themes as you need.
On the top of the Gallery, all available themes bundled with LibreOffice are listed. Click on a theme to see its content in the main window of the Gallery.