Change the default layout and properties of Powershell in Windows 8.1
Edit the "Defaults" which is in the menu above "Properties". This will persist your changes even after closing and re-opening the window.
You should be looking at setting up your Powershell profile. The profile file is usually kept in your user location and contains, amongst other things, the settings for your Powershell session.
This should get you started: http://www.howtogeek.com/50236/customizing-your-powershell-profile/
And there's plenty of reading here on SO if you search for 'Powershell Profile'.