How can I show more than 15 themes at a time in the admin menu?

I have a lot of themes in my test wordpress site. I get a little frustrated that I can’t show more than 15 at a time.

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In pages and posts you can click “screen options” to choose the number, but it looks like “Themes” has no such option.

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Is there another way to increase the number?

It’s hardcoded into the WP_Themes_List_Table class that’s responsible on Line 50.

$per_page = 15;

So in short, you can’t without modifying a core file.

Link to source.