Site Title, Tagline, & Spacing Issues

Hello,

Try to add the below CSS code from the Appearance > Customize > Custom CSS, and check.

#site-header.top-header #site-description {
    display: none;
}

For the page title issue, try to follow the docs: https://docs.oceanwp.org/article/166-disabling-the-page-title
https://docs.oceanwp.org/article/465-hide-page-title-and-keep-breadcrumb

For the title height, try the below code:

#site-header-inner {
    padding: 0px;
}