Inlay Hints
On this page of JetBrains Rider options, you can configure general behavior of inlay hints —configurable editor adornments that improve the 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 settings page Ctrl+Alt+S. |
Reserve double-press-and-hold of the Ctrl key for Push-To-Hint | You may need to clear this checkbox if the press-and-hold or double-press of the Ctrl key is already bound to some other actions in your OS or other applications . |
Default visibility | 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. |