Hello @dbresnick

Can you please provide us your site URL so that it will be easy for us to debug your issue and provide you with some possible solution.

Best Regards!!!

Hello,
Hope you are having a good day,
To solve your issue we have three custom CSS with us you can use either one according to your preference by adding them on Dashboard -> Appearance -> Customize -> Theme Options -> Advanced Options,

The first custom CSS will align the site title center to the logo. If you want this result please paste this custom CSS and ignore others.

.site-title {
    font-size: 30px;
    margin-top: 37px;
}

The second custom CSS will center the site title, tagline and logo. But the site title will be besides the logo. If you want this result please paste this custom css and ignore others.

@media only screen and (min-width: 801px){
.site-branding {
    position: relative;
    left: 25%;
}

}

Or if you would want to center the site title, tagline and logo on the center and move the site tagline and title below the logo add the Custom CSS below. If you want this result please paste this custom CSS and ignore others.

@media only screen and (min-width: 801px){
.site-branding {
    position: relative;
    left: 25%;
}
#site-identity {
    float: left;
    margin-top: 10%;
    right: 19%;
    position: relative;
}

}

We hope it helps,
Best regards.