In the screen, where you type your password to log into your computer, there is an option to choose which of the installed desktop environments / window manager you want to use.
On gnome standard login screen, it is down in the right corner, but there are many of this “lock screens” available and each can place the dropdown(or dropup, lol) anywhere they want. Just search your screen where you have to type your password to login for options.
In the screen, where you type your password to log into your computer, there is an option to choose which of the installed desktop environments / window manager you want to use.
On gnome standard login screen, it is down in the right corner, but there are many of this “lock screens” available and each can place the dropdown(or dropup, lol) anywhere they want. Just search your screen where you have to type your password to login for options.