followalter

This plugin makes the right sidebar on post.php pages (where you edit a post) stick to the top of the screen when you scroll, so all functions of the sidebar stay within reach. It’s works with the classic version of the editor.
If the total height of the sidebar is larger than the window height, the sidebar sticks to the bottom instead, so the whole sidebar can be made visible through scroll.
On top of this, when you publish or update a page, the plugin will make the page scroll down to the previous scroll position.
This saves users from both having to scroll up (because of the stickyness) and having to scroll down again (using the previous scroll position) every time they update a post!

Admin Sticky Sidebar

This plugin makes the right sidebar on post.php pages (where you edit a post) stick to the top of the screen when you scroll, so all functions of the  …

pvs1984

With horizontal tabs plugin you can add 3 tabs that each of them contains unlimited posts. Each tab shows the featured image and the title of each post
<ul>
<li>option to select the category of post in each tab</li>
<li>option to select the width and the height of feautured image</li>
<li>option to select the number of post in tabs</li>
</ul>

Horizontal Tabs Plugin

Horizontal tabs plugin enable to show unlimited posts in 3 tabs

Admin Sticky Sidebar vs Horizontal Tabs Plugin