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This article explains how to sort the Issue matrix panel via priority using the Issue Matrix app. This is ONLY applicable for Jira Server Instances. 

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1. Login to Jira as an Administrator.
2. Navigate to  Cogwheel > Issues > custom fields > Add custom field.
3. Click on All and search for "Issue Matrix" and click on Next as shown in the below screenshot:
   
4. Add a name to the custom field (for example,   Issue Epic_Matrix_2)
5. Add the custom field to the project screen where it is required:
   
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6. Now search for the custom field, which was created in the earlier step. 
7. For the newly created custom field, click the cog wheel > Configure > Edit Matrix Configuration > Epic and click on Next.
8. Configure the details, as shown below and click on Save to save the configuration.