According to our support policy, we prefer one ticket one question:
https://toolset.com/toolset-support-policy/
Lets handles the questions one by one,
I have tried it in your website again, create a simple page + simple view block here:
hidden link
I don't see the problem 1) and 4), can you try to duplicate the same problem in above page, then provide the clue for reproduce the same problem? thanks
Q2) I have checked it in your website, I can see "Views" menu item without any problem, see my screenshot: views
Q3) I assume we are talking about this URL of your website:
hidden link
But the problem does not exist in my localhost(fresh WP installation + only Toolset plugins + 2020 theme), so it should be a compatibility issue, please try as I mentioned above:
In case it is a compatibility problem, please deactivate all other plugins, and switch to wordpress default theme 2020, deactivate all custom PHP/JS code snippets, and test again
Q6) Same as Q3), there isn't the same problem in my localhost, see my screenshot filters.JPG, please check compatibility issue
And there isn't any JS errors in my localhost
Q7) Please edit the problem page, find and select View loop block, in section "Masonry Settings", choose mobile, and set the column value to 1, see screenshot mobile.JPG