Perhaps most users who actively use Drupal 7 use the checkboxes for each module in the general list to disable modules. However, in version 9, this option is no longer available.
To disable modules in Drupal 9, go to the "Uninstall" tab /admin/modules/uninstall and mark the modules you want to remove. At the same time, the process is not a shutdown, but rather the deletion of all data associated with this module. Therefore, be careful, the system can delete related entities and you will lose data.