I've somehow got rid of my navigation bar so that it no longer appears in layout mode, which is a pain I've had this happen a few times, and I can't work out what I've pressed. Now any time I want to use the navigation bar I have to switch over to a different workspace (I think I mean navigation bar: it might also be called the "properties bar"? It's where you go to do stuff like turn down the intensity of your light).
Does anyone have an idea what I might've done?
Thanks in advance, I'm really new to Blender and I couldn't find anyone having the same problem.
Click on the little arrow icon to show the Navigation Bar for the Properties. You've likely dragged the properties area (edge marked in blue) when you wanted to resize the entire area. Instead you should drag with the cursor placed at the green line for the intended result.