Hi,

To move the menu to the left you will need to insert below codes into your custom css

[gist type="php"]

#sp-header .sp-megamenu-wrapper {
-webkit-justify-content: flex-start;
-ms-justify-content: flex-start;
justify-content: flex-start;
}

#sp-header .row {
-webkit-flex-direction: row-reverse;
-ms-flex-direction: row-reverse;
flex-direction: row-reverse;
}

.sp-megamenu-wrapper #offcanvas-toggler.offcanvas-toggler-right {
-webkit-order: 0;
-ms-order: 0;
order: 0;
margin-left: 0;
margin-right: 20px;
}

#offcanvas-toggler.offcanvas-toggler-left {
float: right;
margin-right: 0;
margin-left: 20px;
}

[/gist]