customizing appearance of form page 1

customizing the appearance of the first page of the booking form I can change the text of the button “next”. That works fine for desktops and notebooks.
Using mobile devices e.g. smartphones the first page is divided into two pages, the first one only showing the selection of the appointment type.
To proceed it’s necessary to press a button “next”.
Where can I customize the text of this button, that only appears on mobile devices?

Thanks a lot and kind regards

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