Application specific Permission

Hi - I want to add a new user as Basic user who should be able to see Appian Designer only with specific Application let say "ABA" - nothing else in designer. How to achieve this? I created a user and added to  designer which is added that person to Database and other groups as well which i don't want. I want that user to be administrator of the specific Application "ABA"

Please guide how to achieve this? Documentation is very high level, and self-paced training is not helpful.

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