On this page or JetBrains Rider options, you can configure general behavior of inlay hints — configurable editor adornments that improve readability of your code.
Enable Inlay Hints in .NET Languages
Lets you either enable or disable the entire inlay hints functionality in .NET languages (C#, VB.NET, XAML).
For Web languages and SQL, you can configure inline hints on the Editor | Inlay Hints | Other Languages page of the IDE settings Ctrl+Alt+S.
Reserve press and hold of the Ctrl key for Push-To-Hint
You may need to clear this checkbox if the press-and-hold of the Ctrl key is already bound to some other actions in your OS or other applications.
Use the selector to choose how inlay hints in .NET languages should be displayed in the editor (you can override visibility for each language on language-specific pages in this section) : choose Show Always or Never Show to always show or hide hints, or choose Push-to-Hint to hide the hints by default but show them when you press and hold Ctrl.
Show hints for
Use this checkbox to toggle inlay hints in all Web languages, or use checkboxes under it to toggle hints in specific languages. You can configure specific hints in specific Web languages on thesettings page.