Hello,
Try to add this code in Theme Options > Theme Custom CSS:
.mobile-menu-content .et_b-tab-content { animation: none; }
Clear cache and check then. Let us know the result.
3) Remove the current icon for menu item – http://prntscr.com/t1yu86 or change it to icon of Font Awesome 4.7 version http://prntscr.com/t1yvi2 https://fontawesome.com/v4.7.0/icons/
4) To remove the line for the current menu item, add the next code in Theme Options > Theme Custom CSS:
.header-main-menu.et_element-top-level .menu > .current-menu-item > a:before {
background-color: transparent;
}
.header-main-menu.et_element-top-level .menu > .current-menu-item:hover > a:before {
background-color: #0ab3a3;
}
Regards