Click in the empty last row in the watches window, type the name of the variable (or full expression) and hit enter.
While the debugger has stopped on a breakpoint select a variable name or full expression, right click to open the context menu and then select "Add watch 'expression'".
Select an expression in the editor and drag'n'drop it in the watches window.
While the debugger has stopped on a breakpoint select a variable name or full expression, right click to open the context menu and then select "Add watch 'expression'".
Select an expression in the editor and drag'n'drop it in the watches window.