It seems you are using DnD (Drag and Drop) UI and searching for a component (
row) that is only available in StP (Snap to Place) UI.
When you start a project, by default you will have
Screen1 but will be empty until you drag new components in it.
Will I have to start a new project to get the StP UI?
Yes. Whatever you do in DnD cannot be converted to StP. You need to start a new project.
Make sure there is no tick
Thanks for the help