You might just be limited by your Confluence version here. In newer versions, there's a setting in the UI to tweak this. From the documentation:
To specify how many results should be shown per page,
click a number '10', '20', '50' or '100' near the top of the page.
Ah ok, got it. If you don't want to change the source code or write a plugin, one way to hack your way through this would be to add a mod_rewrite rule that adds those parameters to your URL. Click on 20 or 50 and check the URL - you can add all those parameters when you hit the default path. Not ideal - ideally you'd write a plugin for this - but it'd be a lot easier, especially if you're already using Apache in front of Confluence.
Do you want to modify this in the code?
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