To open the color palette in the Planner 5D iOS app, follow these simple steps:
Tap on the object you wish to modify.
Select 'Edit' to open the customization pop-up menu.
In the 'Style' section, choose the part of the object you want to modify and tap on it.
At the top of the screen, you'll find the 'Brush' icon. Tap on it to open the color palette.
Select the color and intensity that suits your design best.
These steps should allow you to easily customize the color of any object in your design.