Ok.
Go to Additional CSS field in the customizer and remove this block of CSS:
.inside-header {
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
}
.header-widget {
order: 10;
overflow: visible;
}
.nav-float-right .header-widget {
top: auto;
}
.nav-float-right .header-widget .widget {
padding-bottom: 0;
}
.site-branding,
.site-logo {
position: absolute;
left: 50%;
-webkit-transform: translateX(-50%);
transform: translateX(-50%);
z-index: 200;
}
Then set the header alignment to center:
https://docs.generatepress.com/article/header-layout/#header-alignment
Let me know if this gets you closer π