Title: How to Set a Default Application Catalog
Summary: Whenever you connect to an Application Catalog, you can designate it as the default Application Catalog by selecting the "Make this the shared default Application Catalog option" on the Connect Application Catalog dialog box and then clicking the OK button.
Refer to the below screenshot for more details
Outcome: Each time you open AdminStudio, you will be directly logged into the same Application Catalog without entering any details.