Cant do single colour fill?

Hiya,

Next question (on OSX 2018 SP2) ... I'm trying to do a single colour fill. Process is :

RECT

Draw > Hatch / Fill ...

Select "Fill" tab

Select : Colours - One colour

Select a new colour

Select : Boundary settings - Specify entities

Press OK

This then fills the rectangle with a gradient from the selected colour to white rather than a solid fill. I can bodge it using a two colour fill where both colours are the same, but am I missing something obvious?