There are a bunch of Tailwind helpers sprinkled throughout Pinegrow Web Editor:
Use the Swap colors tool from the selected element menu to swap colors in the element and all its descendants.
The same tool is also available in the right-click context menu:
Jump to the visual control
ALT + click on any Tailwind class in the Tree panel to select that element, switch to associated device size & pseudo state and jump to the visual control for that class.
The same happens when you click on a Tailwind class in the class list in the Properties panel.