Notepad++ – Close Tabs on Application Exit

Notepad++ doesn't allow the "drag tab to create a new window" feature unless the file that has been modified is saved (or if the file is new). If this problem persists even after the file is saved, try right-clicking the tab and choosing 'Move to New Instance'.

I am not sure whether it is possible (most probably not possible) to add a background color for the tabs in Notepad++. But somehow it is possible to highlight the tabs in other way which might be helpful too.

From the Menu Bar of Notepad++, go to View -> Show Symbol and enable the option Show White Space and TAB. It will show output like this:

As you can see here, the arrow signs indicating the tab and the dot signs indicating the spaces. Obviously the arrow signs for tabs and dot signs for spaces are for viewing in Notepad++ only but they are not actually present, so you can normally copy the texts in any other place where the arrow sign and dot sign will not be there.

To change the color of the arrow sign/dot sign go to Settings -> style Configurator and in Language section select Global Styles & in Style section select White space symbol and change the Foreground Color as your wish.