Go to Settings -> Apps -> Apps -> AoxVPN, then click "FORCE STOP" OR Go to Settings -> Apps & services -> Apps -> AoxVPN, then click "FORCE STOP".
Go to Settings -> Apps -> App launch -> AoxVPN, then turn off "Auto-launch", "Secondary launch" and "Run in background", close AoxVPN app and launch AoxVPN again OR Go to Settings -> Apps & services -> App launch -> AoxVPN, then turn off "Auto-launch", "Secondary launch" and "Run in background", close AoxVPN app and launch AoxVPN again.