Hi akindelan,
Thanks for reaching out.
I quickly tested it myself and created an ad group with three ads, whose alignment I left at default. If I set the number of visible ads to “three” (or more), the banners are displayed horizontally next to each other. If this doesn’t work, your theme could also be the cause.
If you have tracking installed and are using it, the ads have their own div container, which provides a line break that leads to the ads’ vertical display.
When you activate Advanced Ads Pro, the group functionality is extended with an ad grid option. This is the most comfortable integration of such banners because it can be adjusted most precisely and works with integrated div containers.
Please let me know if you have any further questions about it.
Best regards,
Joachim