The puzzle piece in question is either gone or hidden behind the puzzle panel.
- Conditions for Reproduction: The _corner puzzle bar_ must be showing prior to entering customization…
- Settings Used: show piece, positioned on right, not set to auto-hide, not extended
Recovering the piece can be achieved by toggling a setting on the corner piece's option page or by using the shortcut [CTRL][F2] to hide the bar and clicking the piece which, as it seems, was actually still present.
BTW: You should adjust your wording in the options pages. The keyboard shortcuts aren't for [enabling/disabling] but instead to [show/hide].
The puzzle piece in question is either gone or hidden behind the puzzle panel.
Recovering the piece can be achieved by toggling a setting on the corner piece's option page or by using the shortcut [CTRL][F2] to hide the bar and clicking the piece which, as it seems, was actually still present.
BTW: You should adjust your wording in the options pages. The keyboard shortcuts aren't for [enabling/disabling] but instead to [show/hide].