I am now confused of how to set the preview image of my custom theme.
This file is from FileMaker 15 Training Series, and I find that the preview image is set every time I save changes to the new theme, plus it's a screenshot from the left top of the layout you changed.
It would be great if the preview image shows every features of layout objects like above.
I have tried bds_themeditor but I am still curious about fixing the problem without any plugins.
I am wondering if there is a more proper way to set the preview image(using FileMaker functions).