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 ...
Harry
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Google Translate is to blame for my grammar 
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