Can't configure model settings when using GPT-5

Hi everyone, I have a question. Previously, when I was using GPT-4.1, I was able to configure Agent Settings in the Mastra playground. However, after switching to GPT-5, the option to configure agent settings is no longer available (I can only see the regular model settings like temperature, top-p, etc.). Is this a limitation with GPT-5, a bug, or is there a specific way to enable agent configuration for GPT-5 models? Thanks in advance 🙏