Image with Text section proportions on Flex theme

Hello! I am wanting to use Flex Themes “Image with text” feature as a kind of header, and I would prefer for the image on the let to take up 2/3 of the space and the test take up the remaining 1/3 whereas they are currently 50/50. How would I go about coding for this or is there an option that I’m missing?

This is how it currently looks:

This is how I would prefer it to look (I’m also looking to change up the fonts, but that isn’t as urgent):