Hey Again,

-You can use the Css below to set the Header Container to the Page Container .

Add this into the Custom CSS box located in your Salient Options panel (All custom css provided is tested in the Live Browser so it will work as intended . If you cant see any changes make sure there is no red cross in the Custom CSS Box as that syntax error would cause all css below it to not show up on the Frontend):

@media only screen and (max-width: 690px) {
    body[data-slide-out-widget-area-style="slide-out-from-right-hover"][data-slide-out-widget-area="true"][data-user-set-ocm="off"] #header-outer header > .container {
        max-width: 320px !important;
        padding: 0 !important;
    }
}
@media only screen and (max-width: 999px) and (min-width: 690px) {
    body[data-slide-out-widget-area-style="slide-out-from-right-hover"][data-slide-out-widget-area="true"][data-user-set-ocm="off"] #header-outer header > .container {
        max-width: 600px !important;
        padding: 0 !important;
    }
}

- Unfortunately there is no such option to change the Breakpoint via css alone to lower than 1000px. 

Thanks

Unfortunately there is no such option to match the menu hamburger on the header with the Sliding Menu . You will likely have to switch to a different style of Off Canvas Menu .

Thanks