By Design (Adverb)

With intention; in an intentional manner; "he used that word intentionally"; "I did this by choice".

The architect included a garden in the plans by design to create a peaceful oasis in the middle of the bustling city.
She deliberately left the camera's memory card at home by design, preferring to focus on the moment rather than capture it.
The politician made the provocative statement by design to spark a national conversation about the issue.
The company omitted certain features from the product by design to keep costs down and make it more competitive in the market.
The artist destroyed some of her earlier work by design to free herself from the burden of her past creations.