Thanks for contacting us.
1/ Please provide a screenshot for a better understanding.
You can use Lightshot screenshot or Gyazo tool to make screenshot and share the link here.
Have you read our docs? – https://xstore.helpscoutdocs.com/article/30-base-theme-translation
2/ Go to Header Builder > edit header, then go to Multiple Headers > edit custom header for the Front page.
There is no option to upload different logo images for desktop and mobile versions of the same header.
3/ Please describe your request in more detail.
If you have any other questions, please post them via separate topics – https://www.8theme.com/forums/xstore-wordpress-support-forum/