hook_system_themes_page_alter(&$theme_groups) Alters theme operation links.

An array of configuration names that should be editable. Type:

public ModulesUninstallForm::buildForm(array $form

protected FileSystemForm::getEditableConfigNames()

Default theme implementation for a field. To override output, copy the "field.html.twig" from the templates directory to your theme's directory

Default theme implementation for a marker for new or updated content. Available variables: status:

public SystemController::compactPage($mode)

public SystemManager::getAdminBlock(MenuLinkInterface $instance)

system_authorized_run($callback, $file, $arguments = array(), $page_title = NULL) Setup and invoke an operation

The app root. Type: string File core/modules/system