PL/I Text Editor Advanced Page

The settings you specify on the Tools > Options > Text Editor > PL/I > Advanced page in Visual Studio apply to all projects in your solutions.

Error Reporting
Background syntax check timeout
Specifies the response time (in seconds) after which the background parse is aborted.
Enable background syntax checking
Enabled by default. Enables automatic syntax checking of the code as you type.
Show background syntax check errors in the Error List
Disabled by default. To view the background syntax check errors in the Error List window, set this to True. Red squiggles are always shown in the editor.