I can't delete an element of a page


I recently installed the latest version of Bootstrap and renewed my license.

I can’t remove any html elements from my layout.

Is this a bug or do I need to activate something to be able to edit the layout?

I can duplicate, move, hide, etc. any element (for example, a column), but not delete it.

Thank you

Would you provide some screenshot? I never get those experience before.
If you need help to check the file, i can try to help check it, just send via private message.