This is due to the layers that you have turned on due to the scenes that you are using. The scenes control the layers, but you are also able to control the layers by turning them on and off.
For an example the 'arrows' are on the elevations layer. If you turn the elevations layer off than the arrows will go away but if you tick the elevations layer than the arrows will appear. This is the same for every part of PlusSpec - doors, windows, walls, roofs, cladding, framing, MEP and so on...
Hopefully I was able to help