Need to set the minimum advance booking time through the widget settings to one week (168 hours).
Hi there, @user4148 and welcome to the Community 
Thanks for the idea! If more users show their interest in this feature, we might consider it in the future updates 
To Set how far in advance appointments must be booked;
Please add 1, 2,3 and 4 weeks advanced Pre-booking options
Hey there, @user35192
Thank you for the feedback!
This idea is already on the Wishlist. I’ve merged your comment with the existing request, where we’ll keep you updated