In Android Studio, there is no Create New Project option, only Create New Flutter Project,
I've already uninstalled and installed again Android Studio, but it's still like this:
Can someone help me? How to get back the Create New Project option ?

Try resetting Android Studio. You can do it by deleting its user settings folder.
You will find it here: C:\Users\Yourname.AndroidStudio
You can back up the data by saving or compress it in a zip file and then delete the folder contents. This will install to default.