We expect Kimai v2 to be in a stable feature state by mid of 2019.
Consider upgrading to v2, as our support for v1 will slowly expire until end of 2019.
For example the timesheet, export and expenses screen (which you get by clicking the corresponding tab) is called an extension.
To disable an extension, just add a hash (#) symbol in front of the folder name. To re-enable it, remove the hash.