Can you clarify your question a bit more.
I understand you switch the preview in studio (pro?) but not what you mean with mess up and locking
I've completed this training and never faced the issue you mentioned, so I went back and checked how I had configured things in my app.
What I can see is that for Desktop view, width of all the columns is set to “Auto-fill”, but for both Mobile and Tablet view, the width of some columns is set to “Auto-fill” and of others is “Manual”. Maybe playing with these will return the expected result.