Possible "dumb" question?

I was wondering if our older pool has an issue as there is no drain in the floor? It has a vinyl liner and a single skimmer in the pool wall. The pool came with the house that we purchased and I am used to seeing a drain in the floor of residential pools or do vinyl lined pools normally only have wall skimmers? Hope you are able to have a Happy 4th of July!
 
These things seem to go through cycles of popularity, my pool has only 2 returns and one skimmer, which was a very common design when it was built 30+ years ago, at the time there were lots of concerns with entrapment in floor drains (something that is again in the news in recent years)
 
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