Okay, another stupid question.
How the hell do you walk around while having the build interface up? Arrow keys, that I have assigned the movement keys to, just interact with the build interface while that's up, by scrolling between various option, and I can't move while the interface is up. I can't assign settlers to anything that's far from them because I can't move to select the object I want to assign them to.
PS: Well done, Bethesda, on your consolized UI for the PC. I'm sure millions of PC players who are stubborn enough to use kb&mouse are just worshiping you for it.