2.4.
LyX will then automatically renumber the sections to the new order.
With the buttons
-\begin_inset Info
-type "icon"
-arg "depth-decrement"
+\begin_inset Graphics
+ filename /usr/local/share/lyx/images/promote.png
+ scale 85
+ groupId toolbarbuttons
+
\end_inset
and
-\begin_inset Info
-type "icon"
-arg "depth-increment"
+\begin_inset Graphics
+ filename /usr/local/share/lyx/images/demote.png
+ scale 85
+ groupId toolbarbuttons
+
\end_inset
or the corresponding key bindings