Hi Louay,
Thank you for the proper details, it helps me a lot!
1. Make sure that the swith is enabled, otherwise it will not be displayed, you can enable it here: https://i.imgur.com/RgYBtJC.png
2. I assume, that results, that does not belong to any of the filtered taxonomies are displayed. This is the default behaviour, but in some cases this is not the expected behaviour. To turn off results, that does not belong to any of the category filters, you can turn off this option. It will make sure, that only items related to the filters are displayed.
You can also experiment with these options and combinations, to get the best possible configuration to your needs.
3. I tried the “read” keyword on both instances, but I am seeing results right now. It might have been only a temporary server or connection issue, it should be fine now.
I hope this helps!