In the My resignation tab, in default cases you might find the below option

To Enable/Disable this feature, you can follow below steps

1. Login as administrator

2. Go to uKnowva Configuration-->Apps Manager and Search for PFT custom app

3. Check this setting and enable/disable it

Note: IF you do not find above setting in your instance, then mostly you are running an older version, please either upgrade or write to uKnowva Support