Testing new software is always fun (as long as it's something I am interested in).
Had tried months ago, and back looking at a Japanese fediverse client called The Desk.
Interesting, many, many controls and options. And it can run in similar mode to my tweaked AWI full screen setup.
The Desk is a separate app, not a browser or web site you open.
Find it at : https://thedesk.top/en
Here a screenshot with mastodon.social loaded. In half size to save data transfer. (800x450 pixels)
Full size if interested -- 1600x900 pixels, 165 KB :
https://i.postimg.cc/MHKJsnLM/The-Desk-Full-Screen-1600x900p.jpg