I. Intro
To reset data, you must first delete the data directory. After Lark is re-launched, relevant data will be re-built. The steps to delete your data directory vary for different devices.
II. Steps
Windows
Press the Windows logo key + R to open the Run window, and then paste the path %appdata%\LarkInternational\ in the window. Click Confirm to jump to the LarkInternational folder which you can then delete.
Mac
In Terminal, paste the path open ~/Library/Application\ Support/LarkInternational/ in the window, and then press Enter to jump to the LarkInternational directory which you can then delete.