No man. That's no the function of the developer mode. What you just described is second space and it is available in some Redmi, Samsung, Oppo and Poco android phones.

"Second Space is a feature in MIUI (Xiaomi's Android-based operating system), creates a separate, independent environment on your phone, essentially giving you two separate "phones" in one. It allows you to have different apps, files, settings, and even a different unlock method, all within the same device."

https://nothing.community/d/2759-second-space-miui/2