How to add Open/Close Toggle button into Twenty Fifteen theme for hiding left sidebar?

As you’ve done, you removed the sidebar with CSS, however to display on a toggle you’ll have to use jQuery. You could do something with toggleClass(); on a click function.

In your css you simply add the class that will toggle and then display the sidebar again.

Stretching the site automatically will rely on CSS again. Let me know if there is anything specifically I can help with.

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