On this page, you can set your browser-specific English Wiktionary preferences.edit Note that “Use preferences on this page” must be checked for any of the others to work. Click checkboxes to toggle preferences, stored in a browser cookie. These preferences will have to be refreshed after 30 days.
Some Wiktionary-specific preferences can be enabled, on a per-user basis, through the "Gadgets" tab of Special:Preferences (which will not have to be refreshed periodically).
There is no “cancel” feature, other than turning off all preferences. (Default is to have all boxes unchecked.)