How to edit the logo image
You can edit the column and the Site Logo styles:
The logo and site title fit into the column's width:
You can edit the PetMania text in Customizer > Site Identity.
Next, click on the "Save options" icon and select "Display conditions":
Here, you can add the Header template to whichever post or page.
Editing the Header for mobile resolution
When hiding an element and switching to the view it’s hidden on, you will see that this element is “muted”:
This gives you a clear indication that this element will be hidden on the live site but still enables you to edit it as needed.
You can edit that specific area in the responsive mode in which it is not hidden. For example, if the element is visible on mobile but hidden on desktop and tablet, you will be able to edit the element in the mobile view.
Switch between Desktop, Mobile or Tablet views by clicking on the corresponding icons on the bottom of the panel and edit the content dedicated to the corresponding resolution
How to edit the logo image for mobile:
To set the logo size, visit the Style section of the Site Logo widget. For more information, please check this article Site Logo Widget
*Hint: If you'd instead use another logo image for lower resolutions (recommended in most cases), you can replace it with an Image widget https://elementor.com/help/image-widget/
You can check this guide for more details: Vamtam Elementor Themes: How to edit the Logo image, Site Title, and Tagline?
You can also check this instruction: https://elementor.com/help/mobile-editing/