The resolution of the minecraft launcher changes frequently and even affects the game itself.
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If you're still experiencing this issue, please see the comments on MCL-17021 for a potential fix to the problem. 🙂
This is a common issue with React/Electron apps. Not sure if the Mojang launcher uses it, but in the case of React/Electron apps, it's a problem with the GPU Acceleration not cooperating with the text. There's no way to disable it right now.