Show Add Row Button missing

I have added a table to my app, and it binds to existing data, and I am able to edit existing records bound to the table.
However, when adding a Toolbar to the table, there is no option to "Show Add New Row button". How do I configure my table to allow the adding of new rows? I've read this article, but the UI for my table designer does not look like in the article...there is no "show add row option".

Hello, the article you reading is about legacyTable component. The LagacyTable have been replaced by new Table which is not add button yet.

here is different from them.

Here is workaround for this problem.