How to: Change Preset in OpenCode Desktop /preset

[ProphetOfDoom-PoD]

Hi All,
I have recently setup Oh My Open Code Slim in OpenCode.

I have setup oh-my-opencode-slim.json with 3 presets. A pure OpenAI one, a Pure Free Tier Openrouter one, and then a Mixed one.
My config is good.

However, when i try to change the preset, /preset , nothing is happening at all. I can only change the preset by modifying directly in oh-my-opencode-slim.json.
I am using presets as per : https://github.com/alvinunreal/oh-my-opencode-slim/blob/master/docs/preset-switching.md

Anyone know where i am going wrong? Thanks