A while ago I saw a plugin that adds a button to center the line with [center][\center]. But Now I can’t seem to find it. Is it possible to redirect me to that post?
Tank you 
The official BBCode plugin allows you to use a center tag. Not sure if it has a button, but if not, the Formatting toolbar plugin gives you a button.
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If you don’t want or can’t install a plugin, I also created a theme component with a few buttons
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