This How-to covers deleting history entries from your prevail database.
\uD83D\uDCD8 Instructions
Click the ‘Delete’ button at the top of the History window.
Note: If there are other items linked to the History entry, you will be required to open the individual items to delete them. Deleting one item from a group of linked items does not affect the other linked items.
\uD83D\uDCCB Related articles
Creating a History Entry, Recovering Deleted History Entries