I was able to figure this out on my own. The main window of this version of Remmina is very minimalistic. However, in the notification area, if you click on New Connection, it displays the more detailed view of creating a connection that I'm used to seeing. After you save the connection, you can find it listed when you click on the Remmina icon again in the notification area.
Here's the screenshot that you requested. My computer is in Spanish, but the window layout and icons are the same.
I am using Ubuntu Unity 23.04. At the top of the screen is the panel and notification area towards the right. Of cours, the Remmina main window is toward the left. If you look in the notification area, there is a miniature version of the Remmina icon. On my computer, it is showing up to the left of the HP logo. If you clock on this tiny icon, you will see a menu. The first item in the menu is "New Connection". Click on that and you will get the more advanced method of creating a connection with all the parameters that you need. At the bottom of that you can Save and Connect. Once you save the connection, you can find it two ways. Once by clicking on that tiny icon in the notification area. Second, by going to the main Remmina window.
