To view whitespace the setting is:
// Set to "none" to turn off drawing white space, "selection" to draw only the
// white space within the selection, and "all" to draw all white space
"draw_white_space": "selection",
You can see it if you go into Preferences->Settings Default. If you edit your user settings (Preferences->Settings - User) and add the line as per below, you should get what you want:
{
"color_scheme": "Packages/Color Scheme - Default/Slush & Poppies.tmTheme",
"font_size": 10,
"draw_white_space": "all"
}
Remember the settings are JSON so no trailing commas.
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