Restore Podcast Layout in iTunes 12.4
In the sidebar at the top you have the Podcasts option (just above the Stations one you have just selected) which seems to do what you want - you will see a list of all of your podcasts in the middle column. Then you can switch between unplayed/feed tabs in the right column to see all episodes or just the unplayed ones.

Depending on the defaults the view might be reduced to a text-only list.

Edit including comment from @JosephLeedy:

In order to obtain the three column view similar to the old look, after clicking on "Podcasts," you have to go to View > View Options in the menu (or press ⌘J) and change View As from Classic List to List.