I am also having trouble with this. When I add our logo and use the slider to make it smaller it looks just fine on the desktop to the left of the newsletter title, but in the mobile app it's HUGE and centered. I'm working with The Basic template. argh!
Thank you for reaching out to the Constant Contact Community. I’d be happy to assist you today.
Usually when a Second Generation Editor campaign gets off-center like that, it is due to an image being too large for the area it is inserted into and the template stretches. I took a look at your last campaign and your template is set so the main body width is about 550 pixels wide. That means the images should not be more than 450-500 pixels wide. If you look at my Support Copy of your campaign you will see I resized your images and now the campaign appears centered again. I am not sure if you have tried our Third Generation Editor yet, but those templates are all device responsive and there are no templates stretching issues in that editor. If you would like to take a look, our Welcome to the Third Generation Editor video contains some great information on the tools and functionality!
We would love to assist you further with your account. We do offer Spanish support if you were looking to speak with a Spanish-speaking agent. Here is a link to our Support phone numbers and hours of operation. We can always assist you here in the Community as well. Please let us know if there is anything we can help with!