Is my kitchen sink drain configured incorrectly?

Is there no u?

There should br a “P” to stop sewer gas from coming out of drain . .. . https://www.puroclean.com/blog/how-to-get-rid-of-sewer-gas-smell/

https://www.youtube.com/watch?v=WL-cbQ4OgJ4

The sink drain should have a slight downward slope to allow water to flow properly. A slope of ¼ inch per foot (2%) lets water flow due to gravity.

Pouring boiling water down the drain a couple of times a day for a week should get rid of any flies and larvae.

Thanks, that was all very helpful. Yes, there is a U. I did not take a level to it, but the horizonal pipe may indeed slope a little.

I’m following the guidance on drain flies that says to put baking soda and vinegar down there for some number of nights and flush with hot water in the morning.

As for the flies themselves, I’m not sure what they are. All the pictures I’ve found of drain flies show their silhouette as a triangle like a moth, with wings unfolded. What I see is a little narrow silhouette with wings tucked and the two sides parallel. Is this actually something other than a drain fly?