How do I fill a shape?

I’ve created a rectangle in Writer.
I now want to fill it with a colour of my choosing.

Where is the option to select a colour and complete a ‘fill’ action?

You should explain how you created the rectangle. With default settings, if you use the rectangle shape tool it will be filled with the default colour.

Maybe you drew 4 lines? Or drew an empty polygon?

Can you upload a sample writer document with just the copy of the rectangle? The upload icon is 7th from last with tooltip Upload

Area tab