Hi kimo ! Thank you for your feedback.
The reason is that more buttons won't fit most of the mobile 📱 screens these days. We suggest to make different buttons for different screen sizes, an example: only show the phone number button on mobile.
Mostly you have different actions for mobile and desktop, so playing smart with it can help you ordering your buttons, having some desktop only and some mobile only. Then you're able to make 14 buttons in total.
This is also the case for our pro version, there is a limit for 7 buttons at a time per menu for the same reason.
We may change this for the future, do you have any suggestions how we can make this easier to let our users know? We may need to show some kind of warning I think 🤔
Let us know, and again, thank you for your feedback! 🙂