menu going to the left

Hi there,

that should not affect the layout.
Can you try clearing any cache plugins you're using ?

If still an issue try adding this CSS:

@media(min-width: 768px) {
    .main-navigation ul {
        display: flex;
        justify-content: center;
    }
}

oh I'm sorry, i not using this code
@media(min-width: 768px)
because I want to show it on desktop

Hi there,

Is the navigation alignment option set to center in Customize > Layout > Primary Navigation?

Yes, like I said before, before implemented this tutorial, my menu looks fine

Please check projasaweb.com

The CSS in that documentation should not move the menu.

Can you disable the caching plugin so we can take a closer look at the code?