Please confirm whether you have updated the designthemes-core-features plugin. If not, then go through the following process:
Step 1 : Delete designthemes-core-features plugin through Wp-folder -> wp-content -> plugins.
Step 2 : And then, kindly get into the Dashboard -> Appearance -> Install plugins (Updated plugin).
By installing the updated designthemes-core-features plugin, you can able to view your shortcode plug-ins in the editors