Hover help for variables provides you with a quick way to view the contents of variables in the Source pane. When you point at a variable, a pop-up appears displaying the contents of that variable. This feature is enabled by default when you first start the debugger.
To enable hover help for variables, select Source > Allow Tool Tip Evaluation from the menu bar.
A check mark will appear next to the Allow Tool Tip Evaluation menu item to indicate that hover help for variables is enabled.
To enable hover help for variables as the default: