Hello,
I came across this article while I was searching how to create custom themes in my app and while everything about it is great, I can't get the default properties to override. I figured the different controls I have already added in my app already would have to be manually changed, but when I add new items, the properties are still on the PowerApps defaults. I could be misunderstanding the article, but it made it seem like when you set defaults of a specific control (button and combo box were the examples) in the "OnStart" function, any new control added would have the values I specified.
I guess my question is this: How can I override the default properties of a newly added item to my app without having to manually change every single property?