Im thinking about changing my theme on my shop. How do I do this best without upsetting Google or will that happen no matter what?
How do I know if a new theme is SEO optimized? Is there a list or do you guys have recommendations about what theme to choose?
Im currently using "Focal"
Hope you are doing great, as you want to change your store theme then you can go for themes which are already present there on Shopify as they are already optimized, apart from that if you still want to check if the theme is SEO friendly or not, then you can also check using a tool
GTmetrix (https://gtmetrix.com/). Here are some more recommendations, please check the given blog link - ”https://themeisle.com/blog/best-shopify-themes/ ”.
No theme change does not affect your SERP ranking, yes sometimes user experience matters if the theme is not user friendly then indirectly it can affect your traffic and conversions.
Hope these suggestions will help you.!