In rare cases, a BIG Launcher button can keep blinking even after you have already read the notification from that app and the notification is no longer visible in the Android notification bar.
Clear the blinking-buttons cache
To clear this state, go to the BIG Launcher home screen, tap the three dots next to the clock, and choose “Preferences”. Then choose “Screens’ options”. On the next screen, tap “Clear blinking buttons cache”.
Return to the home screen
When you return to the BIG Launcher home screen, the button should stop blinking.