Hi @ocricciano
Sorry for inconvenience caused to you.
We have clearly given information above page selection regarding it. Check this screenshot for it. https://nimb.ws/5Aokuq
When you select page to display blog from plugin settings, plugin will add blog designer shortcode to that page. So your existing content need to be removed to display blog properly.
Also it will remove content for that page only, all other pages will not be affected.
Still if user want to keep existing content in page and also want to display blog on that page, then it is not necessary to select page for blog from plugin settings. You can add shortcode [wp_blog_designer] directly on any page from admin side.
Let me know if you need further help.
Thank you,