How can I toggle or shrink the WhatsApp web sidebar?

Question

I want to view WhatsApp web in a narrow window next to my other windows. Therefore I want to shrink or toggle the contacts sidebar.

Answer 1

1. Download Stylus (for Chrome or Firefox)
2. Click Stylus icon from the toolbar, click "Manage"
3. Click "Write new style", click "Import"

4. Copy the text below to text box:

   @-moz-document domain("web.whatsapp.com") {
     .k1feT {
       flex-basis: 80px !important;    
     }
   }
   

5. Click "Overwrite Style"
6. Enter a name for your style (e.g. "Whatsapp")
7. Click "Save", refresh Whatsapp Web page.