How to add this new tiles or options also this are not opening properly

This are not opening properly or keep loading. Yes I can add new widgets in this tiles. But how to add new tiles where I can add my custom widgets.

Providing video for support…

Hello

Please install classic widget plugin for widgets: https://wordpress.org/plugins/classic-widgets/
Can you please tell us where you want to add widgets?

Best Regards.

[Author]

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