Disable the try Gutenberg dashboard widget.
Disable the ‘try Gutenberg’ dashboard widget from showing in WordPress 4.9.8.
The plugin will stop the ‘try Gutenberg’ dashboard widget from showing on sites running WordPress 4.9.8. Related ticket on Core, Changeset.
With WordPress 2.7 or above, you can simply go to Plugins > Add New in the WordPress Admin. Next, search for “Disable Gutenberg Dashboard” and click Install Now.
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