diff --git a/gtm2.py b/gtm2.py
index fc2190f..e080036 100755
--- a/gtm2.py
+++ b/gtm2.py
@@ -449,13 +449,16 @@ def handle_mouse_input(stdscr, state):
             if abs(mx - state.divider_col) <= 1:
                 state.dragging_divider = True
             else:
-                # Start a new selection
+                # Switch panes immediately on click
+                state.focus = "left" if mx < state.divider_col else "right"
+                
+                # Also start a potential selection (in case this becomes a drag)
                 state.is_selecting = True
                 state.selection_start_coord = (mx, my)
                 state.selection_end_coord = (mx, my)
-                # Store the click position for later comparison
                 state.click_position = (mx, my)
-                # Redraw immediately to show selection highlight
+                
+                # Redraw immediately to show selection highlight and focus change
                 draw_ui(stdscr, state)
             return