You can color each box title. Defined colors are available for this purpose.

Click on the edit pencil icon to display additional settings.

Here you can set a color code and adjust the brightness of the color. Additionally, you can completely fill the box with color.

Click on the pencil icon once more, and the following options will appear:

You can also enter a hexadecimal color code here. This is helpful if you want to apply the exact color code from another box.