UPDATE

app/src/main/java/com/yono/messeripos/BottomSheets.java

@@ -153,7 +153,7 @@ public class BottomSheets extends BottomSheetDialogFragment {
     }
 
     private void bayar(View view) {
-        
+
 //        String orderId, String paymentType, String bank, long grossAmount
         PaymentsModels paymentsModels1 = new PaymentsModels();
         paymentsModels1.setTransactionStatus("success");

app/src/main/res/layout/activity_q_r_code.xml

 <?xml version="1.0" encoding="utf-8"?>
 
 <androidx.constraintlayout.widget.ConstraintLayout
+    android:id="@+id/bot_sheet"
     android:layout_height="match_parent"
     android:layout_width="match_parent"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     style="@style/Widget.Rounded.BottomSheet"
+    app:behavior_hideable="false"
+    app:behavior_peekHeight="500dp"
     app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior"
     xmlns:android="http://schemas.android.com/apk/res/android">