How to use vertical window as table of content

Dear Vim user

I am trying to find a way to make vim's vertical window works as table
of content.

My question is :
Ctl+W-F open file new horizontal window. Instead
is there any way to make "Ctl+W-F" open file in existing windows like
below ?

+------------------------------------+
| | |
| CH1.txt | Chapter 3 |
| CH2.txt | |
| CH3.txt | xxxxxx |
| | xxxxxxx |
| | |
+------------------------------------+

Thanks in advance

onionsjk

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