How do I keep the preview window open at all times when making/altering items?
When editing an item and you wish to see immediate changes, you can open the properties in a seperate window (right-click the item and select this option). Make the changes in this window – while keeping the other properties window selected to “Preview”. You can also just click and drag the properties and preview tabs to make the window “split screen” this is probably the best way. 1 window- and you can split the screen up quite a few ways with all the tabs available.