I used the classic editor to produce the View. and am showing the form and results on the page. There for on the page I only have a block called "View" of which there is no setting as you show on your screen.
In classic view, you can try these:
In section "Custom Search Settings", enable option "Let me choose individual settings manually"-> "Show only available options for each input". see my screenshot show.JPG
If you don't see section "Custom Search Settings", you can click link "Screen Options", enable option "Custom Search Settings".
this appears to be a bug when updating to 1.4 , I am happy to give you access to this dev environment for you to test on, however I have tested on 2 different hosting environments, and the same bug occurred on updating.
Thanks for the details, I can see the problem in your website.
Then I have tried it in my localhost with a fresh WP installation + the latest version of Toolset plugins, it works.
so the problem is abnormal, please check these in your website:
1) In case it is a compatibility problem, please deactivate all other plugins, and switch to wordpress default theme 2021, and test again
2) 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, I need to test and debug it in my localhost, thanks https://toolset.com/faq/provide-supporters-copy-site/