I take it, that you are able to delete a single app (e.g. AlarmDroid) from the ALL list, using the strikethrough circle icon on the right side of AlarmDroid, aren't you?
If so, then a long press on the left side of an app at the ALL list should highlight this app and the ALL page should go in the multi-select mode (header shows the count of the selected apps).
If you can't reach this multi-select mode, you might uninstall the Play Store app's updates and updates it again.
Settings, Apps, All, Google Play Store, Uninstall updates ...
Google Translate is to blame for my grammar