The layout of the top bar has changed with 3.6.5, I enclose the screens of the problem.
It also happens with other themes.
If the layout with the top bar was saved with 3.6.4, do not give problems with 3.6.5.
The problem with the 3.6.5 shows up if you save a new layout with the sidebar on the right or left and then change it to the top.
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I have updated the details of the ticket with the code.