If you have updated to WordPress 4.7, you would have already noticed the missing underline and justify buttons in the post editor. It was decided to remove them from the editor because underlining is a bad practice as readers can get it confused with links and justifying has uneven browser implementations and in many cases is bad for readability.
In case you badly miss those features from your editor, worry not. There is a way to add them back to your editor by installing a simple plugin.
Once you have activated the plugin, go to Settings –> Writing page to configure the plugin.
By default, the Editor style will be set to ‘Default – without underline & justify buttons’. You need to change it either to ‘Re-add underline & justify buttons’ or ‘Re-add underline & justify + rearrange’.
If you choose the first option, they will be added to the second row of post editor buttons.
If you choose the second option, the buttons will be added to the same position as they were before WordPress 4.7’s update to the Editor.
Don’t forget to hit ‘Save Changes’ before leaving else you won’t be able to view the buttons.
You can now visit Posts –> Add New page and you will be able to find underline and justify text buttons added back to the post editor.
Thus I hope this post helped you learn how to add the underline and justify buttons back to the post editor. If you liked this post, you may also want to see my tips to optimize WordPress to reduce server overload.