What component is missing in the system?

Question

C++ / C#

In Visual Studio 2017, tooltips from the .net framework are displayed fine.
Example:
Third-party software does not have them. Example:
When trying to install the .net Framework, it says that everything is already installed in the system. Next, I additionally install Visual Studio 2015
into the system and prompts in third-party software begin to display
normally . I apologize if the question is asked incorrectly, I'm not strong in this topic.