I've installed the Investa template and template settings onto an existing Joomla 4 site I'm building and I want to change the colour of the background of the header, the background to where the menu and logo are displayed.

In Joomla administrator, I go to: System>Site Template Styles>Investa>Template Options and go to Presets.

I edit Preset 1 and change the Header Background Color to one of my choosing, click Apply and then save the template. But the colour doesn't change. I've tried the same changing the Topbar background colour as well with the same result.

If I enable Custom Style, the page changes to a new colour scheme but If I change any of the colours, they aren't applied.

Under Advanced I have disabled Compress CSS files and have tried turning on and off SCSS.

What am I doing wrong?