You can drag the right border of the thumbnail pane to the right but there's a limit to how big it will go.
A trick to get a larger view is to change the slide size in Page Set Up
Double the standard sizes to keep the ratio the same so if it's 25.4 x 19.05 (cm) make it 50.8 x 38.1
It will still show OK and you can put the sizes back if you need to print
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