Hello,
Thanks for contacting us.
Where exactly do you see this warning? Please provide a screenshot.
Lightshot Screenshot tool https://app.prntscr.com/en/index.html makes screenshots and generates links then you can provide links of screenshots here via Private Content area – https://prnt.sc/u7vwsg
If you want to completely change the demo version of the site, it is recommended to run import on fresh WordPress installation https://wordpress.org/plugins/wordpress-database-reset/ If you want to import sections from different demos, use XStore studio. Just edit page using Elementor > click here – https://prnt.sc/udpfle and import the desired block.
Let us know if you need any further assistance.
Regards