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This is something that gets asked quite a lot, but in all fairness, it is bordering on obsessive compulsive to stress over the state of the recent files list — when displayed in icon form at least. It is what it is, and there's going to be a reason why every thumbnail is on that page. I say this as someone who had exactly the same thoughts about the recent files list, wanting to remove that one 'fly-in-the-ointment' that spoils your nice array of pictures.
But go ask for the feature on the Feedback site. Like I say, plenty of people have asked the same question, and Bridge demonstrates that it is doable.
This is where you make feature requests