Hello,
This is our "Loader animation" feature, which appears for tables that take a bit longer to load.
As you can see on the ChangeLog, for version 6.6, our developers implemented these placeholders (loaders) during table and chart loading, due to a lot of user requests for it.

In short, any time a table ( or chart) takes a bit longer to load, this 'loader' animation will show on the Page until it's ready/loaded.

For now, there is no way for users to edit/change this feature, it is automatically added to each table and chart.

This 'loader animation/image' will take up the same space which your table will take when it loads on the page.

Here is an example of how the loader looks. 

That is what the users see on the page before the table appears.

And here you can see a short Video demonstration of how the loader looks for a Table with 1 row.

For now, there are no built-in ways to customize the color, change to another image etc, but our developers are working to add some customization options for the 'loader' as soon as possible.

When it gets finished, we will add a note about it to the ChangeLog.


- If you don't like this feature, you can disable it globally for all tables, in the Main Plugin settings/Loader visibility.

I hope that helps to explain it, but let me know if you have any questions.

Thank you.