diff --git a/lua/avante/sidebar.lua b/lua/avante/sidebar.lua
index cb1054e..09dbd7a 100644
--- a/lua/avante/sidebar.lua
+++ b/lua/avante/sidebar.lua
@@ -1385,9 +1385,11 @@ function Sidebar:create_input()
       width = win_width - 2, -- Subtract the width of the input box borders
     },
   }, {
+    disable_cursor_position_patch = true,
     prompt = Config.windows.prompt.prefix,
-    default_value = "",
+    default_value = " ",
     on_submit = function(user_input)
+      user_input = Utils.trim_spaces(user_input)
       if user_input == "" then
         self:create_input()
         return
diff --git a/lua/avante/utils/init.lua b/lua/avante/utils/init.lua
index d5506cc..754cd7e 100644
--- a/lua/avante/utils/init.lua
+++ b/lua/avante/utils/init.lua
@@ -30,11 +30,14 @@ function M.trim(str, opts)
   if not opts then
     return str
   end
+  local res = str
   if opts.suffix then
-    return str:sub(-1) == opts.suffix and str:sub(1, -2) or str
-  elseif opts.prefix then
-    return str:sub(1, 1) == opts.prefix and str:sub(2) or str
+    res = str:sub(#str - #opts.suffix + 1) == opts.suffix and str:sub(1, #str - #opts.suffix) or str
   end
+  if opts.prefix then
+    res = str:sub(1, #opts.prefix) == opts.prefix and str:sub(#opts.prefix + 1) or str
+  end
+  return res
 end
 
 function M.in_visual_mode()
@@ -316,4 +319,8 @@ function M.is_sidebar_buffer(bufnr)
   return v == true
 end
 
+function M.trim_spaces(s)
+  return s:match("^%s*(.-)%s*$")
+end
+
 return M