Inlay hints are special markers that appear in the editor and provide you with additional information about your code, like the names of the parameters. Other types of hints inform you about annotations, usages, and so on (depending on the language).
In inlay hints settings, you can configure what types of information you want to get in hints.
Change inlay hints appearance
In the Settings dialog (Control+Alt+S), go to , then select Inline hints.
Select the inlay hint type and state, and configure the font color and effects as required.