Google has revamped its Gemini web app to improve the user experience and pave the way for future additions. The new design features a centered prompt instead of being at the bottom of the page, as well as changes to the tools section. This redesign allows for more room to add new tools in the future. The suggested queries remain unchanged near the bottom of the screen, while the model selector drop-down stays in the top-left corner and file/microphone buttons are still accessible via the prompt box corners.
Source: https://www.androidpolice.com/google-gemini-homepage-redesign-web