add demo.queue for canceling jobs

app.py

@@ -183,4 +183,5 @@ with gr.Blocks(title="RFD3 Test") as demo:
     #visualize_btn.click(load_viewer, inputs=[batch_dropdown, design_dropdown, gen_results], outputs=viewer)
 
 if __name__ == "__main__":
+    demo.queue()
     demo.launch()