Disable standard main menu and custom logo

Hi,
I installed your plugin and I like it, but I would some information to arrange some aspects.
1. I sat a left mobile menu, but the standard main menu remains visible on the right side. I would it doesn’t display. How can I do? In the setting there is the possibility to “Hide Elements with css or code. Can you help me to find the right css or code?

2. I created a specific mobile menu. I saw that there is the possibility to use icons for every item. I would sat the Facebook icon near the menu item “Follow us on Facebook”, but seems it’s not possible. Why? Can it be a problem linked with my theme (that is Journalistic)?

3. In the Header options > Logo Options, I could choose a logo. I would set my website logo, but I also would it displays only when users scroll. Now, is I set a logo, they display two at the same time. How could I do? Is there a css or a code to set that the logo displays after people start to scroll?

Thanks in advance for the help.
Best regards
PS
I hope to have been clear ??