Good morning, I hope you are feeling very well.
Regarding the sharing option, because Figma automatically takes it as an extra entry and charges it to the bill, in the professional plan it appears that you can share files.
I think the best thing would be if they automatically placed the viewr restriction option and if you want to change it to the edit or view option, notify that same day that there will be an extra charge.
I look forward to your response and have a great day.