diff --git a/data/gui/macros/custom_options_tree.cfg b/data/gui/macros/custom_options_tree.cfg
index 90dded4c50b..15b8ea7c5e6 100644
--- a/data/gui/macros/custom_options_tree.cfg
+++ b/data/gui/macros/custom_options_tree.cfg
@@ -16,6 +16,7 @@
 		[column]
 			border = "all"
 			border_size = 5
+			horizontal_grow = true
 
 			[label]
 				id = "no_options_notice"