--- nono/debugger/branchhistory.cpp	2026/04/29 17:05:09	1.1.1.5
+++ nono/debugger/branchhistory.cpp	2026/04/29 17:05:13	1.1.1.6
@@ -23,7 +23,8 @@ BranchHistory::BranchHistory(bool is_exh
 	ClearAlias();
 
 	monitor.func = ToMonitorCallback(&BranchHistory::MonitorUpdate);
-	monitor.SetSize(55, 33);
+	monitor.SetSize(55, 1 + 32); // ヘッダ1行とエントリ数
+	monitor.SetMaxHeight(1 + 256);
 	if (is_exhist) {
 		monitor.Regist(ID_SUBWIN_EXHIST);
 	} else {