You can change the severity of a case from the Cases page or the case details page.
To change the severity of a case:
On the Cases page, do one of the following:
For a single case, at the end of the row click More Options
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> Change Severity.For multiple cases, select the checkbox next to each case name and click Actions > Change Severity.
In the dialog box, select a severity from the menu and enter an optional note.
Click Save.
You can also change the severity of a case from the case details page. Click the current severity and select a new one from the drop down menu.