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The answer depends on the plan you are on.
On the free plan:
- You can create a single group with unlimited buttons.
On the premium plan:
- You can create unlimited groups with unlimited buttons.
Disclaimer: It ís possible to create unlimited buttons in a group, but the front-end will only ever display 7 buttons in a group at max. You can use the fact that you can have more than 7 buttons in a group, for example, by displaying some buttons on mobile and some on desktop.