Update app.py

app.py

@@ -208,9 +208,7 @@ with gr.Blocks(css=MODEL_SELECTION_CSS, theme='gradio/soft') as demo:
             with gr.Column(scale=1, min_width=180):
                 gr.Markdown("GradioChat", elem_id="left-top")
 
-                with gr.Column(elem_id="left-pane"):
-                    chat_back_btn = gr.Button("Back", elem_id="chat-back-btn")
-                    
+                with gr.Column(elem_id="left-pane"):                    
                     with gr.Accordion("Histories", elem_id="chat-history-accordion", open=True):
                         channel_btns.append(gr.Button(channels[0], elem_classes=["custom-btn-highlight"]))