Looks like floating Windows. Not editing in tabs. Try using shortcut Ctrl+0 or CMD+0.
Using either both zoom tool and keyboard shortcuts didn't work at all.
Also when open a file it shows it at 1% zoom size
If Zoom us not working correctly for you try resetting your Photoshop's preferences. The shortcust and menu items should work.
Others have reported Open opens documents at 1% zoom. They may have posted a solution do a search.
You can also setup script events using menu File>Scripts>Script Event manager set up a new event handler for Open and new document events that runs an action that does a menu View>Fit on Screen. Its Shortcut Ctrl+0 these menu Items and their shortcuts should work. Again if they do not try resetting you user ID Photoshop's preferences.