To Make Default for Database in Plesk, Please follow the following steps :-
1) Login to Plesk control panel.

2) Click on Websites & Domains.

3) Click on Databases.

6) Click on Click on Database.

7) Click a Check box on Database Username, Click on Make Default for Webadmin

The selected database user was marked as default.
![GRABWEB [India] GRABWEB [India]](/templates/lagom2/assets/img/logo/logo_big.454175622.gif)