Hi @David_S-CandM,
I wanted to follow up and let you know that I've looked into this further and found a workaround. While my previous post was correct, Lucid AI doesn't currently support directly selecting or changing shape colors. However, you can follow the steps below to set default background colors so the second diagram created matches the first.
1:Use Lucid AI to generate your first diagram.
2: Then locate the Themes option
located on the side panel.
3: In Themes, you’ll see a section called "Choose a theme". At the top, it shows the current theme (in my example it is Chalk).
Click on the edit icon next to the theme name to open the Edit Styles view.
4: Once in the Edit Styles view go the Default section, then select the Fill Color you want to use. This will apply to the container background.
5: Once you generate your second diagram, it should automatically use the same background color you selected in Default.
Please let me know if you have any questions.