Missing Visual Editor Customization Buttons

The visual editor customization buttons are shown in a single row by default. Clicking on the last button will display another row. In a few occasions, these buttons disappear when your WordPress update attempt fail due to various reasons.

 

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To fix the issue, you'll have to back-up your site and then re-install your WordPress installation under Dashboard >> Updates >> Re-install Now.

 

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If you not comfortable with reinstalling your WordPress at the dashboard, please reach out to your web host to reinstall WordPress at the backed.