'''Master Page''' - Impress comes with a collection of master slides. Click on the master slides section from task panel on right side of the working window, and click on the master slide you want to select for your presentation.
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Impress comes with a collection of master slides which you can use it for to change the slide background. Click on the '''master slide''' section from task panel on right side of the working window, and click on the slide design which you want to apply for your slide.
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After you select background for your slide and to apply the same background to all the slides in your file, right click on the master slide from side panel and select "'''Apply o all slides'''".