Thanks for writing in! When you import the Ethos 1 demo content, you will be importing the Ethos 1 theme option settings. At the moment, your site does not look like the demo because you have installed and activated UberMenu. Please deactivate the UberMenu plugin first.
And to understand how the standard demo content works, it is best that you review this knowledge base article: https://theme.co/apex/forum/t/setup-demo-content/56
Hope this helps.