Should I delete the theme "The GEM" demo pages

I purchased WP theme The GEM. Very good theme.
Since I did full file import - there are a lot of demo pages on my site.

My question is: will those pages get indexed by Google if I just leave then where they are? Their status is “Published” Should I change their status one by one to avoid indexing if I want to keep them for later use?

Change the status to “Draft” or move it to “Trash” and don’t empty your trash.

When they are Publish - they are visible to Google, in other case no.

Thank you