Development Workbench Editor format characters visible

Hi,

I am using the SAP HANA Web-based Development Workbench Editor.

The editor is displaying symbols for the formatting characters. E.g. A paragraph symbol, a small arrow for a tab, and a dot for a space.

I think I must have accidentally hit a shortcut key to cause this but I have not been able to figure out how to reverse it.

My question then is how to show or hide these characters in

the SAP HANA Web-based Development Workbench Editor.

Thanks for any help.

Mel