Hey, thanks for the report. This started with the latest update. On startup, Cursor now opens in the Agents Window.
To make the Editor Window the default again: Cursor Settings > Agents > turn off Open Agents Window on startup.
If you don’t see that toggle or it doesn’t work after you turn it off, you can switch back using Ctrl+Shift+N, or Command Palette Ctrl+Shift+P > Open Editor Window.
Let me know if that helped. If the toggle is missing or doesn’t save, tell me and we can look into it separately.