Ash here from the Shopify team. I'm happy to help out with your theme related question.
I understand that you're looking to change the logo placement on your Venture theme to make it centered in the header. While there is no default option to change the logo placement for Venture, this could absolutely be accomplished via a code customization to the theme. I'm unable to say the exact customization required at this time, but I'm happy to loop in our theme support team for further assistance. I've just sent you an email to the email address associated with your Shopify Community account. Please reply to that email, and as soon as I've authenticated you on the shop in question we can move forward with this request.