As the "Check for updates" entry in the settings page's action bar is gone, this is now impossible.
Let's not put this back on the Settings page, but rather on the updates page, or perhaps on the sidebar, to the right of the Updates list item.
Git commit 1f9ed386e5ceebb285adc9de0ffc5aa856f0f7bd by Aleix Pol. Committed on 10/01/2018 at 01:46. Pushed by apol into branch 'master'. Expose global actions again M +3 -1 discover/qml/SourcesPage.qml M +5 -0 libdiscover/resources/ResourcesModel.h https://commits.kde.org/discover/1f9ed386e5ceebb285adc9de0ffc5aa856f0f7bd