We’ve got a button for hiding the Startup app interface for better preview. Please, check the button with arrows at the top-right corner is toggled on:
![I Can't Choose Blocks - There is No Left Panel with Blocks Categories, 2019 12 17 13 04 34 scaled I Can't Choose Blocks - There is No Left Panel with Blocks Categories, 2019 12 17 13 04 34 scaled](https://help.designmodo.com/wp-content/uploads/2019/12/2019-12-17_13-04-34-scaled.jpg)
We’ve got a button for hiding the Startup app interface for better preview. Please, check the button with arrows at the top-right corner is toggled on: