Materials in UI - barsandcat/HMS-Sunflower GitHub Wiki
https://www.youtube.com/watch?v=-qo3ix-qqAE
Instead of composing widget using multiple images, you should instead compose them in material. There is tool kit for working with materials - free plugin from unreal - ui material lab https://www.unrealengine.com/marketplace/en-US/product/ui-material-lab