How to slow down human discovery of new planets?

I'm building a sci-fi world set a couple hundred years into the future. If humans were to suddenly discover FTL space travel (which are handwaved away as generic sci-fi warp speed or something) in a nearby year like 2020, then by something like the year 2400, surely humans would have colonized tons of planets. The problem is though, I don't have the time to write down ultra-detailed histories or map out entire continents for thousands of planets, so how can I force the humans to only discover a few planets (say, 40 or 50) and stop, or at least slow down the rate of discovery massively?

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How to slow down human discovery of new planets?

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