Not able to add new page in DEvelop mode

Hello, I created an app using quickstart and trying to intégrate new pages , but there is no options in Develop mode ; before it was possible to add new pages but not anymore, what am I doing wrong, or is this a bug??

Builder content link
e.g. Builder.io: Visual Development Platform

Builder public api key

What are you trying to accomplish
Trying to add new page models

Code stack you are integrating Builder with
NextJS, react