Dash In Front Of Site Name

Hi there,

do you mean the line above the Menu items?
If so go to Customizer > Additional CSS and remove this part of the CSS:

.main-navigation .menu > .menu-item > a::after {
    content: "";
    position: absolute;
    right: 50;
    left: 50%;
    top: 0px;
    -webkit-transform: translateX(-50%);
    transform: translateX(-50%);
    display: block;
    width: 0;
    height: 2px;
    background-color: currentColor;
    transition: 0.3s width ease;
}

.main-navigation .menu > .menu-item > a:hover::after,
.main-navigation .menu > .menu-item > a:focus::after,
.main-navigation .menu > .current-menu-item > a::after{
    width: 30px;
}

Hi David,
The dash is in the address bar beside the Favicon.
So at this level site reads , ''favicon - Skin Locale'' .
Will this assist it?

Oh that :)
Check the SEO Title you have set in Yoast - this article explains:

https://yoast.com/wordpress/plugins/seo/titles-and-meta-descriptions/

Part you're probably looking for is under this heading in the article:
Set templates for your SEO titles and meta descriptions