Bounce

Derp! Said everywhere someone has helped and I simply overlooked the proper tab. Off to try again.
 
Worked! Thanks for everyone for your patience. Putting the code:
 
/**
 * This file is for your custom CSS.
 * This file is not modified or overwritten during upgrades
 */
#ipsLayout_header header > .ipsLayout_container {
    height: 275px !important;
}
#elSiteTitle, #elLogo {
    height: 275px !important;
}
 
in the proper place (edit html/css; CUSTOM css) made the difference.

Derp! Said everywhere someone has helped and I simply overlooked the proper tab. Off to try again.
 
Worked! Thanks for everyone for your patience. Putting the code:
 
/**
 * This file is for your custom CSS.
 * This file is not modified or overwritten during upgrades
 */
#ipsLayout_header header > .ipsLayout_container {
    height: 275px !important;
}
#elSiteTitle, #elLogo {
    height: 275px !important;
}
 
in the proper place (edit html/css; CUSTOM css) made the difference.

Derp! Said everywhere someone has helped and I simply overlooked the proper tab. Off to try again.
 
Worked! Thanks for everyone for your patience. Putting the code:
 
/**
 * This file is for your custom CSS.
 * This file is not modified or overwritten during upgrades
 */
#ipsLayout_header header > .ipsLayout_container {
    height: 275px !important;
}
#elSiteTitle, #elLogo {
    height: 275px !important;
}
 
in the proper place (edit html/css; CUSTOM css) made the difference.

With a previous v4.5.x change in recent weeks, the Customization/Theme settings added a new limit to the size of the Logo Image to 100% of the banner. That forces all our themes to reduce the size of the photo to unusable. Is there a way to make the photo larger (increasing the limiter above 100%) or increase the banner size by 4 so that 100% becomes usable again?        

Derp! Said everywhere someone has helped and I simply overlooked the proper tab. Off to try again.
 
Worked! Thanks for everyone for your patience. Putting the code:
 
/**
 * This file is for your custom CSS.
 * This file is not modified or overwritten during upgrades
 */
#ipsLayout_header header > .ipsLayout_container {
    height: 275px !important;
}
#elSiteTitle, #elLogo {
    height: 275px !important;
}
 
in the proper place (edit html/css; CUSTOM css) made the difference.

The codes should be placed in your CUSTOM.CSS file, not global or header...

I have the same issue as TS. I have tested all the code suggestions here, but none of them seems to work. 
I think it is the size of the Header bar that causes this, but I might be wrong. 

Your current header image is 800px wide by 275px high and with a bit of fiddling with the CSS you can get it to show full size, but then you would need to adjust the @media CSS code to mitigate the responsiveness. It's not difficult, just fiddly.

That's how it would look.  You'd have to take a look at the @media commands to get the responsiveness going in the right direction for smaller screens. This is the code for full screen, add it to your custom CSS file.  If it doesn't work add !important before the semi-colon on each command, just in case something else is overriding.
#ipsLayout_header header > .ipsLayout_container { height: 275px; } #elSiteTitle, #elLogo { height: 275px; } 🙂

Add this to your theme's custom.css file:
/* Header Logo in IPS 4.5 */ #elSiteTitle, #elLogo { height: 80% !important; } Adjust the height % as per your requirement.