Resize Form Logo: when i try to resize my logo, the interface requires that the first digit is a "1". How do i change that to 600?

when i try to resize my logo, the interface requires that the first digit is a "1". How do i change that to 600? 

Greetings,

Thanks for reaching out to us!

To avoid that, please click that lock icon between width and height to prevent dimensions having the same ratio and then put your desired numbers:

Please give a try and let us know if the issue still persists.

Thank you!

Ah. Perfect