Under Joomla 3

Go to Extensions -> Manage -> Manage. Type 'Bare' in the search box.

Select the 'Bare 960 Responsive Installation Package' package then click on Uninstall. This will remove everything that has been installed through that package.

Under Joomla 4 or 5

Go to System. In the Manage section, go to Extensions.

Type 'Bare' in the search box.

Select the 'Bare 960 Responsive Installation Package' package then click on Uninstall. This will remove everything that has been installed through that package.