Hi Thomas,
Thanks for reaching out and thanks for using BoldGrid Post and Page Builder for WordPress!
Sorry you’re having trouble with this, it can be a bit confusing at first. When you reactivate the native WordPress editor it doesn’t have the functionality to switch back to Post and Page Builder from that interface. What you should do is click the three dots in the upper right (outlined in red below) to show more, then under plugins you should see the option to switch back to the PPB editor.
We have an article you can follow along with if you would like more information on choosing a preferred page editor.
I hope this helps. Please reach back out if you have any other questions for us.