diff --git a/doc/doxygen.conf.in b/doc/doxygen.conf.in
index ca2c35f..0d467f1 100644
--- a/doc/doxygen.conf.in
+++ b/doc/doxygen.conf.in
@@ -1363,7 +1363,7 @@ GENERATE_TREEVIEW      = YES
 # Minimum value: 0, maximum value: 20, default value: 4.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-ENUM_VALUES_PER_LINE   = 1
+ENUM_VALUES_PER_LINE   = 4
 
 # If the treeview is enabled (see GENERATE_TREEVIEW) then this tag can be used
 # to set the initial width (in pixels) of the frame in which the tree is shown.