How do I show which apps i have open? (Samsung Galaxy Note 4)

On my Samsung Galaxy Note 4 I used to be able to see my open apps by long holding the home button. However, I accidentally changed a setting so that Google Assistant would open when I pressed it instead. To return to how it was, I uninstalled the Google app, but the long hold to show my open apps has not returned. How do I restore this function?

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