Header (Brick Lane)
Learn how to configure the theme header and footer here. In your control panel, go to Storefront > My Themes, click the blue "Customize" button to launch Theme Editor, then select the "Theme Styles" icon. In the left hand column of the Theme Editor, click the panel labelled 'Header & Footer'.
Image Based Logo
Image Logo Size
You can adjust the size of the logo here.
Please note before you consider adjusting the recommended sizes, take a look at how three of the biggest brands on the planet size their logos.
Text Based Logo
Configure the size and color of your text based logo here.