Hello,
Thanks for the question on changing the header text so that it is not shown in all caps. The Visual Editor is showing how the text is set in the CSS for theme that you are using. In order to change it, you should be able click on the pencil icon in the Visual Editor to open the menus for editing the text. We’re not sure which text you’re referring to, but if it’s the Site title you can select Custom Font and then change the fonts. If it is not the text you’re trying to change, then you will need to make a change to the CSS. You can use the Inspect Element function with the Chrome Editor to find the CSS that you need to change.