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Please check the below thread.

How to set the Dashboard Listing menu as open as standard?
https://forums.appthemes.com/help-using-classipress/how-set-dashboard-listing-menu-103944/

Please try.

Wordpress Admin > Classipress > Settings > General > Open Graph [ ] Representing site pages in the social networks.

Untick.

Please check.

Shortcodes Relating to ClassiPress
https://docs.appthemes.com/classipress-4-x/shortcodes-relating-classipress-4-x/

I use Front End PM Pro.
https://www.shamimsplugins.com/products/front-end-pm-pro/

Front End PM Pro works well with Classipress in my site.

Thanks @madmanc
I really appreciate your help.

Topbar menu > "+Signup" button

Please help to change the text from "+Signup" to "Register". Change hollow button to solid button similar to "Login" solid button.