Hi David,
Thanks for reaching out with and thank you for using the Grid One theme with BoldGrid Post and Page Builder for WordPress!
The Grid One theme is considered one of our legacy themes and customizer controls are somewhat outdated so its not as intuitive as it should be so I definitely see how you got stomped here after testing it myself.
I was able to center your image with some custom CSS. You might have to adjust the amount of pixels a bit to get it to display properly on your end but if you visit the Advanced > Custom JS & CSS and add the bit below it should help:
.boldgrid-section img:not(.aligncenter) {
margin-left: 150px;
}
If you’re looking for a theme that gives you more control over your site design and customization I would definitely recommend our Crio Pro WordPress theme. Crio builds on Grid Ones controls and design approach but there are over 400 easy to use and fully customizatable settings that make small changes like this effortless.
I hope this helps David!