diff --git a/README.md b/README.md
index 9476fb1..06cb515 100644
--- a/README.md
+++ b/README.md
@@ -250,8 +250,8 @@ More examples can be found in:
 | `g:plug_timeout`    | 60                                | Time limit of each task in seconds (*Ruby & Python*)   |
 | `g:plug_retries`    | 2                                 | Number of retries in case of timeout (*Ruby & Python*) |
 | `g:plug_shallow`    | 1                                 | Use shallow clone                                      |
-| `g:plug_window`     | `vertical topleft new`            | Command to open plug window                            |
-| `g:plug_pwindow`    | `above 12new`                     | Command to open preview window in `PlugDiff`           |
+| `g:plug_window`     | `-tabnew`                         | Command to open plug window                            |
+| `g:plug_pwindow`    | `vertical rightbelow new`         | Command to open preview window in `PlugDiff`           |
 | `g:plug_url_format` | `https://git::@github.com/%s.git` | `printf` format to build repo URL (Only applies to the subsequent `Plug` commands) |
 
 
diff --git a/doc/plug.txt b/doc/plug.txt
index 3cad4f9..18ba7a5 100644
--- a/doc/plug.txt
+++ b/doc/plug.txt
@@ -1,4 +1,4 @@
-plug.txt	plug	Last change: February 23 2024
+plug.txt	plug	Last change: March 7 2024
 PLUG - TABLE OF CONTENTS                                         *plug* *plug-toc*
 ==============================================================================
 
@@ -230,8 +230,8 @@ Reload .vimrc and `:PlugInstall` to install plugins.
   `g:plug_timeout`     | 60                                | Time limit of each task in seconds (Ruby & Python)
   `g:plug_retries`     | 2                                 | Number of retries in case of timeout (Ruby & Python)
   `g:plug_shallow`     | 1                                 | Use shallow clone
-  `g:plug_window`      |  `vertical topleft new`             | Command to open plug window
-  `g:plug_pwindow`     |  `above 12new`                      | Command to open preview window in  `PlugDiff`
+  `g:plug_window`      |  `-tabnew`                          | Command to open plug window
+  `g:plug_pwindow`     |  `vertical rightbelow new`          | Command to open preview window in  `PlugDiff`
   `g:plug_url_format`  |  `https://git::@github.com/%s.git`  |  `printf`  format to build repo URL (Only applies to the subsequent  `Plug`  commands)
  --------------------+-----------------------------------+-----------------------------------------------------------------------------------
 
diff --git a/plug.vim b/plug.vim
index f9827bc..3badb4d 100644
--- a/plug.vim
+++ b/plug.vim
@@ -878,7 +878,7 @@ function! s:lastline(msg)
 endfunction
 
 function! s:new_window()
-  execute get(g:, 'plug_window', 'vertical topleft new')
+  execute get(g:, 'plug_window', '-tabnew')
 endfunction
 
 function! s:plug_window_exists()
@@ -2684,8 +2684,8 @@ function! s:preview_commit()
     return
   endif
 
-  if exists('g:plug_pwindow') && !s:is_preview_window_open()
-    execute g:plug_pwindow
+  if !s:is_preview_window_open()
+    execute get(g:, 'plug_pwindow', 'vertical rightbelow new')
     execute 'e' title
   else
     execute 'pedit' title
diff --git a/test/workflow.vader b/test/workflow.vader
index e7ecc7a..83d075e 100644
--- a/test/workflow.vader
+++ b/test/workflow.vader
@@ -371,6 +371,9 @@ Execute (PlugDiff - 'No updates.'):
   q
 
 Execute (New commits on remote, PlugUpdate, then PlugDiff):
+  let g:plug_window = 'vertical topleft new'
+  let g:plug_pwindow = 'above 12new'
+
   for repo in ['seoul256.vim', 'vim-emoji']
     for _ in range(2)
       call system(printf('cd /tmp/vim-plug-test/junegunn/%s && git commit --allow-empty -m "update"', repo))
@@ -458,6 +461,8 @@ Execute (New commits on remote, PlugUpdate, then PlugDiff):
   AssertEqual 1, &previewwindow
   pclose
 
+  unlet g:plug_window g:plug_pwindow
+
 Execute (Test g:plug_pwindow):
   let g:plug_pwindow = 'below 5new'
   PlugDiff
@@ -1709,6 +1714,8 @@ Execute (#530 - Comparison of incompatible git URIs):
   Assert !CompareURI('https://github.com/junegunn/vim-plug.git', 'https://github.com:12345/junegunn/vim-plug.git')
 
 Execute (#532 - Reuse plug window):
+  let g:plug_window = 'vertical topleft new'
+  let g:plug_pwindow = 'above 12new'
   call plug#begin()
   Plug 'junegunn/goyo.vim'
   call plug#end()
@@ -1735,6 +1742,8 @@ Execute (#532 - Reuse plug window):
   AssertEqual 2, winnr('$'), 'Three windows after PlugStatus (but got '.winnr('$').')'
   q
 
+  unlet g:plug_window g:plug_pwindow
+
 Execute (#766 - Allow cloning into an empty directory):
   let d = '/tmp/vim-plug-test/goyo-already'
   call system('rm -rf ' . d)