In current scenario, we will be disabling the theme for the current user. Similarly, we can use the same technique to enable the theme.
Open 'Vamhi Kali : User Settings' by going to
Your profile > 'Vamhi Kali : User Settings'
To enable/disable the dark theme property by checking/unchecking the checking box.
Click on Save button.
After you see confirmation message, hard reload your browser.
(Tip : Ctrl/Cmd + Shift + R to hard reload chrome browser)
You're all set! As you can see the dark theme has been disabled.