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The following is the display on the MUI page:

Examples

Not sure what this section is. I like that you are showing samples, but it's a mix of classic and UX here with nothing to explain. Add something here indicating that these handlebars are used for the shown classic/MUI piece.

2) pstoolbar

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3) gridAddBtn/gridDeleteBtn

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1) pstoolbar 

This handlebar is used to display the highlighted fields on the MUI page.

Also, the Toolbar actions that exist in classic page appear in MUI when this Toolbar is used.

2) gridAddBtn/gridDeleteBtn

This handlebar is used to map grid row add and delete buttons.

3) gridtabs

This handlebar is used to map gridtabs.