How to show Available Themes over 24 themes per page?

I just upload Farms 133 theme pack and i found it show only 24 themes/page then visitor must click page 1 - 5 page for select theme that they like. How increase Available Themes over 24 theme per page like WordPress.com that show all theme (175 themes) in 1 page.

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P.S. Actually this question not relate your themes or your plugin, It about WordPress Multisite modified. If you know, Please suggest me. Thanks.