When using the legend function you may encounter issues with the legend not displaying a colour for certain items.
Fig 1. A legend item with no colour
This will occur if there are multiple shapes associated with an item and one or more of those shapes are different colours.
To resolve this you will need to check each shape under that item and ensure they are all the same colour. In your estimate, click on the item to view all shapes associated with it.
Fig 2. Linked shapes in the calculation sheet
Look through each shape, ensuring they are all the same colour. When you find the offending shape and change the colour the legend will reflect this.
To change the colour, select the shape, The shape will highlight green on the viewport. The colour will be displayed in the colour field on the top toolbar. To view this toolbar, click on the Home tab, Colour is displayed under the Format group.
Fig 3. Colour tool in the Format group
Click on the Colour tool and select the same colour as other shapes for that item. The colour will then appear on the legend correctly.
Fig 4. Colour showing correctly on the legend
If the colour is still not visible there are potentially more shapes that are different colours.