diff --git a/main.py b/docman.py
similarity index 65%
rename from main.py
rename to docman.py
index 8a3df53..833cbe9 100644
--- a/main.py
+++ b/docman.py
@@ -13,23 +13,30 @@ class PyLlamaWindow(Gtk.ApplicationWindow):
         super().__init__(application=application, title=title)	
         self.set_default_size(800, 600)
         self.cur_ai_response = None
+        self.gpu_spin = None
         
         self.model_store = Gtk.StringList()
         self.model_dropdown = Gtk.DropDown()
         self.model_dropdown.set_model(self.model_store)
         self.model_dropdown.set_tooltip_text("Select model")
-        self.model_dropdown.set_enable_search(True)
+
+        model_preferences = Gtk.Button()
+        icon = Gtk.Image.new_from_icon_name("view-more-symbolic")
+        model_preferences.set_child(icon)
+        model_preferences.set_tooltip_text("Preferences")
+        model_preferences.connect("clicked", self.on_preferences_clicked)
 
         header = Gtk.HeaderBar()
         header.set_show_title_buttons(True)
         header.pack_start(self.model_dropdown)
+        header.pack_start(model_preferences)
         
         self.set_titlebar(header)
         
-        vbox = Gtk.Box.new(Gtk.Orientation.VERTICAL, 6)
+        vbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=6)
         set_margin_all(vbox, 8)
         
-        self.listbox = Gtk.ListBox.new()
+        self.listbox = Gtk.ListBox()
         self.listbox.set_selection_mode(Gtk.SelectionMode.NONE)
         self.listbox.set_focusable(True)
         
@@ -54,6 +61,35 @@ class PyLlamaWindow(Gtk.ApplicationWindow):
         self.current_model = None
         self.populate_models()
 
+    def hold_prompt(self, *_):
+        self.entry.set_placeholder_text("Wait for response...")
+        self.listbox.grab_focus()
+        self.entry.set_sensitive(False)
+
+    def unhold_prompt(self, *_):
+        self.entry.set_placeholder_text("Type message and press Enter...")
+        self.entry.set_sensitive(True)
+        self.entry.grab_focus()
+        
+    def on_preferences_clicked(self, button):
+        box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=6)
+        set_margin_all(box, 8)
+
+        label = Gtk.Label(label="GPU Layers")
+        label.set_xalign(0.0)
+        
+        self.gpu_spin = Gtk.SpinButton(adjustment=Gtk.Adjustment(
+            value=10, lower=0, upper=100, step_increment=1
+        ), digits=0, hexpand=True)
+
+        box.append(label)
+        box.append(self.gpu_spin)
+
+        preferences_popover = Gtk.Popover(position=Gtk.PositionType.BOTTOM)
+        preferences_popover.set_child(box)
+        preferences_popover.set_parent(button)
+        preferences_popover.popup()
+        
     def populate_models(self):
         try:
             models = ollama.list()
@@ -64,18 +100,19 @@ class PyLlamaWindow(Gtk.ApplicationWindow):
         names = [m.model for m in models["models"]]
         self.model_store.splice(0, len(list(self.model_store)), names)
 
-    def add_message(self, text=None, sender=True):
+    def add_message(self, text="", sender=True):
         label = Gtk.Label()
         label.set_selectable(True)
         label.set_wrap(True)
         label.set_xalign(1.0 if sender else 0.0)
-        label.set_text("" if not text else text)
+        label.set_text(text)
         set_margin_all(label, 8)
-
+        
         row = Gtk.ListBoxRow()
         row.set_child(label)
-        self.listbox.append(row)
 
+        self.listbox.append(row)
+        
         adj = self.listbox.get_adjustment()
         adj.set_value(adj.get_upper())
 
@@ -95,15 +132,16 @@ class PyLlamaWindow(Gtk.ApplicationWindow):
 
         buffer.delete_text(0, -1) # Delete all text
         self.add_message(text=text)
-        self.cur_ai_response = self.add_message(text=None, sender=False)
+        self.cur_ai_response = self.add_message(sender=False)
 
         self.listbox.grab_focus()
         self.entry.set_sensitive(False)
         
         app = self.get_application()
         model = self.model_dropdown.get_selected_item().get_string()
+        num_gpu = self.gpu_spin.get_value_as_int() if self.gpu_spin else 10
         app.loop.call_soon_threadsafe(lambda: asyncio.create_task(
-            app.send_prompt(model, text)
+            app.send_prompt(model, text, num_gpu)
         ))
         
 class PyLlama(Gtk.Application):
@@ -124,11 +162,12 @@ class PyLlama(Gtk.Application):
         self.loop.run_forever()
         return True
     
-    async def send_prompt(self, model, text):
-        messages = [{ "role": "user", "content": text, "options": { "num_gpu": 100, "main_gpu": 0 } }]
-        async for part in await self.client.chat(model=model, messages=messages, stream=True):
+    async def send_prompt(self, model, text="", num_gpu=10):
+        messages = [{ "role": "user", "content": text }]
+        GLib.idle_add(self.window.hold_prompt, True)
+        async for part in await self.client.chat(model=model, messages=messages, stream=True, options={ "num_gpu": num_gpu }):
             GLib.idle_add(self.window.add_response_part, part.message.content)
-        GLib.idle_add(self.window.entry.set_sensitive, True)
+        GLib.idle_add(self.window.unhold_prompt, True)
         
 if __name__ == "__main__":
     app = PyLlama()