When QQ logs in, how to cancel the function of sending SMS to get verification code?

When QQ logs in, the method of canceling sending SMS by mobile phone to obtain verification code is as follows (take word20 19 of windows 10 system as an example):

1, open QQ, and click the avatar in the upper left corner.

2. Click the Settings button at the bottom left in the interface that will open later.

3. In the next interface, click the account security button.

4. Click the device lock button in the automatic pop-up interface.

5. In the interface that opens automatically, turn off the switch behind the device lock.