Ah - I’m not aware of a way to batch indent a whole bunch of lines, but you can go to the System Monitor Sensor Settings, Sensors Details section and manually add spaces using the edit button on each label that you want:
If you want that stuff with the indent you’re looking for, you’d better make a conky. That being said, I’d still like to know which widget that is. If it’s the system monitor sensor with text only, I pressume parts are cut in the original screenshot.