I'm glad that the OP's issue was resolved, but I am encountering a similar issue here and after trying the text size at 100% it still looked the same. I can make a new post on its own, but thought it's best to keep things related in the same thread
Attached some examples of what's going on. The launcher itself (looks the same either 200% or 100% scale) and the full desktop at 100% scale for reference. It's a 5k monitor, so 100% gets pretty tiny.
Similar to OP, I have uninstalled the game and downloaded and reinstalled it but get the same old launcher problem. I'll reach out to support as well, but for visibility to anyone else experiencing this, I'll post my answer whenever I get one.
Cheers--