slider image on home page just disappeared

I’m seeing a slider but it seems to have only demo images.

As you use a commercial theme and need support, please use their official support channel. We feel they are best equipped to support their products.

https://www.pagelines.com/support/

That said, first thing I’d do is clear your cache — you’re using WP Super Cache.

PlatformPro has never included its own version of jquery, and has never had a functions.js https://cl.ly/2A0Z0n2g1k2F

I dont know where you got that copy of the theme from but I suggest you get a fresh copy from GitHub.

That theme was EOL years ago and the source is open now.
https://github.com/pagelines/platformpro