Views:
Question:
Is it possible to hide certain events from the workflow history?

Answer: 
By product design, it is not possible to hide all or particular events of the workflow history. 

KBA applicable for both Cloud and On-premise Organizations.
This article is valid for DocuWare versions: 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 | Hide events from the workflow history