In assistant settings, let us pin our favourite models and put the others in an other section. There are a lot of models and I only use a handful of them, so pinning my favourite models would unclutter the drop down menu while still keeping the models for those who use them. Others who use different models would have their own pinned models.
T3 Chat has your favourite models pinned and then there is a show all that you can click and it shows all available models and you can pin them or even just use them once if you need to.

