We used to be able to change the thickness of the outline border that is around the entire newsletter. I can't seem to find those options anymore. If anyone knows how to do it, please share ideas.
Hello @AlionaO ,
Specific email templates will have borders around them. Any templates with borders between the inner and outer background areas are of a fixed size, so there's no way of adjusting them beyond coloring (typically the divider default coloring under the Design tab).