With the new release, I have to go to View and select Format and data for every edit. When you click on format, the data panel disappears! This is a fantastic way to make PBI even more click heavy. You've just made every job both harder and longer (and it's not like PBi is a quick tool to start with - yr on yr is a joke in this software). Big shoutout for coming up with an update that makes this tool even worse. Quite an achievement!
The "Visualization" pane has been removed in this new version in favor of a menu on the object. A "pane switcher" has also been introduced to align with Office's "one pane at a time" model and give you more space on the canvas.
So based on the above, you need to switch back and forth between data and format. Of course this is a preview feature, if you find it inconvenient, you can still use the old version. You just need to turn off On-object interaction and restart your PBI Desktop.