Sublime Text can be reverted to a freshly installed state by removing your data folder. Depending on your operating system, this folder is located in:
To revert to a freshly installed state, you can:
When restarted, a fresh data folder will be created, just as it was the first time you ran Sublime Text. Keep in mind that this will also remove all of your settings and packages. The backup copy of your data folder can be used to retrieve configuration, or custom packages that can not be reinstalled.
On OS X, the ~/Library folder is hidden by default. To navigate there, select themenu item in Finder, and type in ~/Library.
In Windows, cache files are stored in a separate location, %LOCALAPPDATA%\Sublime Text 3, to improve performance with roaming profiles.