It's not one of the stars that form the recognizable shape of the constellation, but rather sits within the boundaries of the constellation, making it one of the stars that make up the whole constellation area.
To be more precise:
* Epsilon Sagittarii is near the tail of Sagittarius, which is a region of the constellation known as the "Teapot".
* It forms part of the "Milk Dipper" asterism, a smaller pattern of stars within the larger constellation, alongside other stars like Zeta Sagittarii and Delta Sagittarii.
You can easily find Epsilon Sagittarii using a star chart or a stargazing app, which will show you its exact position within the constellation.