@PitaJ is correct, the option is called the "tags whitelist", and you can decide which tags to allow, and do so on a per-category basis
Where is the code of receiving new posts and displaying red dot notification?
As the title implies, I am looking for the code of it, and wants to write my own product logic using QML.
Primarily I've debugged and found the code at
Before and after, the red dot appears.
After hundreds of debug processes, I've finally found the function which is used to do that. Here is screenshot: