You want to give your shapes in Board a personal touch. Find out how to change their color to better organize your ideas and make your visuals more attractive.
1 - Go to “Shapes"
Go to the outboard bar, then click on "Add", then "Shapes".
2 - Select your shape
Choose the shape of your choice and draw it on your Board
3 - Change color
Choose the colors of the shape as well as its outline
By clicking on the pointer (at the bottom right of your toolbar), click on your shape, then you can change the color of its outline as well as its color.
For full details of the toolbar's functions, see this article: How to use the editing features of the toolbar?