Right now it's showing certified and user opted in games when the filter is active. The idea was that you'd enable the "use steam play with all games" option and then this filter would show the official whitelist and anything you've specifically whitelisted. I could tweak the localization but we will likely be reworking a lot of this as we go along.
That does make a little sense, still, doesn't seem to be working like that. My shot as the example includes titles like Fieldrunners and Fieldrunners 2 which neither has any Steam Play set on them in my client (and never has). Same with Doki Doki, a game again I've never touched.
Is this still a problem? The filter seems to work for me as @austinp-valve indicated.
Yup, if the idea is to show whitelist + what I personally force SP on then yes it works fine. Closing.
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Using the newly added big picture mode filter, to show only steam play white-listed titles doesn't work as intended. It shows a lot more. This was tested with steam play only turned on for "supported" titles as per the option, the other setting was left off (and yes I restarted Steam to be sure).
https://www.gamingonlinux.com/uploads/articles/article_media/15384328091581588953gol1.jpg