Hello.
Thank you for contacting us.
1. For the footer, we have enabled the Elementor editor for the footer custom post type. Now you can use the elementor to edit the footer.
2. For the sidebar content, that is widget off-canvas content. Please go to the widget and edit the Off-canvas widget content.
3. For the header transparent, we have to go to theme options/ header/ header 4/ enable header float and select the navigation background color is transparent, navigation text color is white. Save the config and refresh your browser cache. You will have a transparent header as you want.
Please check it again.
Thanks.