diff --git a/lua/cp/commands/init.lua b/lua/cp/commands/init.lua
index a7bd626..c8ebc23 100644
--- a/lua/cp/commands/init.lua
+++ b/lua/cp/commands/init.lua
@@ -109,6 +109,8 @@ function M.handle_command(opts)
     if cmd.action == 'interact' then
       ui.toggle_interactive(cmd.interactor_cmd)
     elseif cmd.action == 'run' then
+      ui.run_io_view()
+    elseif cmd.action == 'panel' then
       ui.toggle_panel()
     elseif cmd.action == 'debug' then
       ui.toggle_panel({ debug = true })
diff --git a/lua/cp/config.lua b/lua/cp/config.lua
index 4e787b4..bb02eca 100644
--- a/lua/cp/config.lua
+++ b/lua/cp/config.lua
@@ -32,6 +32,8 @@
 ---@field before_run? fun(state: cp.State)
 ---@field before_debug? fun(state: cp.State)
 ---@field setup_code? fun(state: cp.State)
+---@field setup_io_input? fun(bufnr: integer, state: cp.State)
+---@field setup_io_output? fun(bufnr: integer, state: cp.State)
 
 ---@class CpUI
 ---@field panel PanelConfig
diff --git a/lua/cp/constants.lua b/lua/cp/constants.lua
index dce8751..310363f 100644
--- a/lua/cp/constants.lua
+++ b/lua/cp/constants.lua
@@ -1,7 +1,7 @@
 local M = {}
 
 M.PLATFORMS = { 'atcoder', 'codeforces', 'cses' }
-M.ACTIONS = { 'run', 'next', 'prev', 'pick', 'cache', 'interact' }
+M.ACTIONS = { 'run', 'panel', 'debug', 'next', 'prev', 'pick', 'cache', 'interact' }
 
 M.PLATFORM_DISPLAY_NAMES = {
   atcoder = 'AtCoder',
diff --git a/lua/cp/ui/panel.lua b/lua/cp/ui/panel.lua
index b680588..0e2690a 100644
--- a/lua/cp/ui/panel.lua
+++ b/lua/cp/ui/panel.lua
@@ -227,6 +227,7 @@ function M.ensure_io_view()
     return
   end
 
+  local solution_win = state.get_solution_win()
   local io_state = state.get_io_view_state()
   local output_buf, input_buf, output_win, input_win
 
@@ -236,11 +237,12 @@ function M.ensure_io_view()
     output_win = io_state.output_win
     input_win = io_state.input_win
   else
-    local solution_win = state.get_solution_win()
     vim.api.nvim_set_current_win(solution_win)
 
     vim.cmd.vsplit()
     output_win = vim.api.nvim_get_current_win()
+    local width = math.floor(vim.o.columns * 0.3)
+    vim.api.nvim_win_set_width(output_win, width)
     output_buf = utils.create_buffer_with_options()
     vim.api.nvim_win_set_buf(output_win, output_buf)
 
@@ -255,6 +257,14 @@ function M.ensure_io_view()
       output_win = output_win,
       input_win = input_win,
     })
+
+    local config = config_module.get_config()
+    if config.hooks and config.hooks.setup_io_output then
+      pcall(config.hooks.setup_io_output, output_buf, state)
+    end
+    if config.hooks and config.hooks.setup_io_input then
+      pcall(config.hooks.setup_io_input, input_buf, state)
+    end
   end
 
   local test_cases = cache.get_test_cases(platform, contest_id, problem_id)
@@ -269,7 +279,7 @@ function M.ensure_io_view()
   utils.update_buffer_content(input_buf, input_lines, nil, nil)
   utils.update_buffer_content(output_buf, {}, nil, nil)
 
-  vim.api.nvim_set_current_win(output_win)
+  vim.api.nvim_set_current_win(solution_win)
 end
 
 function M.run_io_view()