In the example, the 'Reviews' header should be hidden because it's inside a conditional that checks whether the field 'Reviews' has any content. I have tried all the methods I can find but none of them work.
I have tried it in my localhost with fresh WP installation + the latest version of Toolset plugins, it works fine, please try these:
1) Make sure you are using the latest version of Toolset plugins, you can download them here: https://toolset.com/account/downloads/
2) In case it is a compatibility problem, please deactivate all other plugins, and switch to WordPress default theme 2021, deactivate all custom PHP/JS code snippets, and test again
4) If the problem still persists, please provide database dump file(ZIP file) of your website, you can put the package files in your own google drive disk, share the link only, also point out the problem page URL, I need to test and debug it in my localhost, thanks https://toolset.com/faq/provide-supporters-copy-site/