To change to Monokai (Sublime theme):
Settings -> Style Configurator ->
Select Theme -> Monokai -> Save & Close
To change default font size:
Settings -> Style Configurator ->
Global Styles -> Default Style -> Font size
To change default cusor (Caret) color:
Settings -> Style Configurator ->
Global Styles -> Caret colour -> White
To change default width of cursor (Caret):
Settings -> Preferences ->
Editing -> Width -> 2
To change default space or tab color:
Settings -> Style Configurator ->
Global Styles -> White space symbol-> White
To show tabs differently than spaces:
View -> Show Symbol -> Show White Space and TAB