Slide Properties
Sets slide orientation, slide margins, background and other layout options.
To change the background of all of the slides in the active file, select a background, click OK and click Yes in the Page Setup dialog.
LibreOffice 7.3 Help
Sets slide orientation, slide margins, background and other layout options.
To change the background of all of the slides in the active file, select a background, click OK and click Yes in the Page Setup dialog.