Hello @CInno,
This isn’t an issue at all. As we have explained in our changelog why we have change it:
Starting with the Layout Pane, you will see that it now features the nested, filesystem-esque structure that was introduced into Skeleton Mode in a previous release:
The main catalyst for updating the Layout Pane came out of the desire to allow for nested Row and Column layouts. Our previous Layout Pane was designed specifically to make the creation of single-layer layouts as effortless as possible (i.e. Section → Row → Column → Elements). While it served this desired outcome well, over the years it became apparent that an increasing number of users wished to create more intricate layouts that required multiple rows inside of a parent row.
Switching the Layout Pane to this nested view allows our users to infinitely nest content as they see fit for their designs. Additionally, it has opened up various movements that were not previously available in the Layout Pane (such as dragging a column from one Row to another). The simplified and condensed interface also gives users the ability to more easily move content throughout a design.
Meanwhile, you can still revert back to the previous stable version X 6.5.6 and Cornerstone 3.5.5. This was the version that still sports the accordion-style layout pane and not like what we have in this latest build which is now using the skeleton mode or dropdown structure.
Thank you for your understanding.