Update

app.py

@@ -121,7 +121,8 @@ with gr.Blocks(css='style.css') as demo:
                     'The base model must be compatible with Stable Diffusion v1.5.',
                     interactive=ALLOW_CHANGING_BASE_MODEL)
             with gr.Column(scale=0.3):
-                change_base_model_button = gr.Button('Change base model')
+                change_base_model_button = gr.Button(
+                    'Change base model', interactive=ALLOW_CHANGING_BASE_MODEL)
         if not ALLOW_CHANGING_BASE_MODEL:
             gr.Markdown(
                 '''The base model is not allowed to be changed in this Space so as not to slow down the demo, but it can be changed if you duplicate the Space. <a href="https://huggingface.co/spaces/{SPACE_ID}?duplicate=true"><img style="display: inline; margin-top: 0em; margin-bottom: 0em" src="https://bit.ly/3gLdBN6" alt="Duplicate Space" /></a>'''