How do I remove all plugin data on uninstallation?

To remove all plugin data on uninstallation, go to the Other tab:

To remove all plugin data on uninstallation, go to the Other tab:

"Other" tab in plugin settings

Then, select the box to "Delete, plugin, data, and settings (full removal) when uninstalling.

Delete plugin, data, and settings (full removal) when uninstalling

Be sure to click "Save Changes" at the bottom.