Index: binaries/data/mods/public/gui/session/selection_details.js
===================================================================
--- binaries/data/mods/public/gui/session/selection_details.js
+++ binaries/data/mods/public/gui/session/selection_details.js
@@ -301,7 +301,13 @@
 	Engine.GetGUIObjectByName("playerColorBackground").sprite =
 		"color:" + g_DiplomacyColors.getPlayerColor(entState.player, 128);
 
-	Engine.GetGUIObjectByName("primary").caption = primaryName;
+	let primaryElement = Engine.GetGUIObjectByName("primary");
+	primaryElement.caption = primaryName;
+	const textDimension = primaryElement.size;
+	const margin = secondaryName ? 0 : 17;
+	textDimension.bottom = textDimension.top + primaryElement.getTextSize().height + margin;
+	primaryElement.size = textDimension;
+
 	Engine.GetGUIObjectByName("secondary").caption = !secondaryName || primaryName == secondaryName ? "" :
 		sprintf(translate("(%(secondaryName)s)"), {
 			"secondaryName": secondaryName