The act of installing or uninstalling a theme is a common practice when administering a Drupal website. Let's try installing Stark and making it our default theme in place of Bartik.
Currently, the only uninstalled theme is Stark, and we can easily move this into the installed state by following these two steps:
We can also see what the Stark theme looks like by clicking on the Back to site link in the Admin menu, which will take us back to the frontend of our website. We are now presented with an unstyled page, which is to help demonstrate the clean markup of Drupal.
It is just as easy to uninstall a theme, and one nice feature of Drupal 8 is that it ensures that we have at least one installed theme set as default. Otherwise, we won't even have the option of uninstalling the theme.
Let's navigate back to the Appearance admin located at /admin/appearance
and uninstall the Stark theme by following these two steps:
We saw how simple it is to install and uninstall themes within Drupal 8. Another common task we will find ourselves completing within the Appearance admin is adjusting the settings of a theme.