Hidden Function add attribute with ALT+ENTER in Entity file

i installed Cuba Studio one month ago and now when i sue combination key ALT+ENTER the guide to create a new attribute hidden.
May you help me?
Thank You

This action is a part of the Entity Designer - one of Premium Studio features.
It is available only when the subscription (trial or commercial) is active.

i am using cuba platform by many times, is this latest features?

For new users Studio suggests a 28-day trial subscription. Probably you have activated it and used Premium features during that time.

But the simply form add attribute was enable without extension of premium version by long times… now disabling the add attribute form… whole the platform is not usable.
in the last update you disabled this function for all user!!