Highlight Matching Delimiters
When you work with code in the editor, JetBrains Rider can help you quickly understand code structure by highlighting the opening or closing delimiter ((), [], {}, and <>) when you set the caret at its pair. Any opening parenthesis, bracket, brace or quote (altogether called "delimiters") can be highlighted with color or outline whenever you place the caret at the corresponding closing delimiter, and vice versa.
Highlighting of matching delimiters is enabled by default. To disable it, clear Highlight matched brace on the page of JetBrains Rider settings Ctrl+Alt+S.