After updating to Snagit 13.1, I no longer see my QuickEffects.
This issue has been fixed in Snagit 13.1.1. To install the latest version open Snagit and browse to the file menu Help > Check for updates.
To view your QuickEffects, hover your cursor over the "Effects" heading until your cursor turns into a double arrow, and then click and drag downwards to resize the Effects pane. Your QuickEffects should then appear.