Oh, they do have psychological manipulation in mind.
There are 2 leading design types:
No clocks anywhere, designed to be difficult to navigate out of, designed to make the passage of time difficult to tell.
And open and bright with easy lines of sight, designed to allow gamblers to relax without leaving.

https://www.casinousa.com/blog/psychology-of-casino-design

The former was developed by an ex-gambler that "turned their life around" into an architect that manipulates gamblers to gamble more. He studied the successful casinos, and gathered up all the techniques that makes gamblers gamble more.
The open layout was developed in response to this, and solely concentrates on making gamblers feel relaxed (or able to relax).

But lighting, layout, smells, sounds... Everything is accounted for.
Casino owners know the design of their casino is what makes gamblers gamble more