I’m making a game and I’ve already done the progress bars part and I wanted to know how to customize it to look like this or similar
Reid’s channel has a great tutorial on this here: Unreal Engine - Damageable Health Bar Tutorial (1/2) - YouTube.
Hey @SansaoSZ! Welcome to the Forums!
If you are looking for the bar to be animated as well, check out this great non-Epic affiliated example on how to do so:
Good luck on creating your progress bars!
Greetings @SansaoSZ !
Welcome to the Unreal Engine community! 
Just so you’re aware, this topic has been moved from the Community - Showcase - Game Development forum category to the Development - Programming & Scripting - UI forum category. The Showcase forums are for artists and game devs to showcase/display their works-in-progress. We have other forum categories for questions and discussions.
Just remember, when posting, please review the categories to ensure your topic is posted in the most relevant space.
Wishing you the best with your progress bars,
Your Friendly Neighborhood Moderator 