Select Dropdown into main menu

Now add this CSS:

.main-navigation:not(.slideout-navigation) .main-nav {
    flex: 1;
}
.main-navigation:not(.slideout-navigation) .main-nav > ul {
    display: flex;
}
.main-navigation:not(.slideout-navigation) .main-nav ul li.search-item {
    order: -1;
}
.main-navigation:not(.slideout-navigation) .main-nav ul li.slideout-toggle {
    margin-right: auto;
}

#site-navigation .navigation-branding {
    position: absolute;
    left: 80px;
}

Thanks David.
Really you are very helpful and very professional.

Thanks for time

You're welcome = i am glad to be of help