Docognito hides ChatGPT in a library by disguising the screen as a document. A reading room means a stream of strangers glancing from behind for hours, not one seated neighbour, and fixed carrels often cannot turn away from a walkway. Toggle the disguise before you sit, since a silent floor makes fixing the screen mid-session conspicuous.
Why a reading room is a harder test than a desk
A library reading room does not put one person across from you for an afternoon, it puts dozens of different people behind you across the length of a whole session. People walk the stacks continuously, back and forth between the shelves and the exit, and every pass gives whoever is walking a brief look at the back of your screen. A single passer-by rarely stops or studies what they see. The threat is not one long look, it is many short ones, repeated across the hours a study session actually runs, and any one of those glances is enough to register a chat window even without reading a single word of it.
That is a different problem from a coworker at the next desk or a stranger sitting across a cafe table for twenty minutes. the visible page, redrawn as a document editor answers the version of the problem where somebody actually stops and reads. A stream of walkers behind you is a volume problem, not a depth problem, and it needs the shape of the screen to read as ordinary at a glance, since there is rarely a second glance to catch anything the first one missed.
Carrels and fixed tables you cannot turn
Cafe seating is loose. Chairs move, tables get chosen fresh each visit, and a bad angle is one shuffled chair away from a better one. Library seating is often the opposite. A carrel is built into the wall or the shelving run and faces whichever way it was built to face, usually straight down the aisle between two ranges of shelves. A long reading-room table is fixed to the floor. Neither one turns.
That single fact changes what picking a better seat even means here. Somewhere else, a bad angle is a five second fix. In a library, the carrel that faces the main aisle is often the only one free most afternoons, and the seat you get is the seat you keep for the rest of the session. The screen itself has to do the work a seat change would do anywhere else, which is the whole case for turning a chat window into something that reads as ordinary paperwork before anyone walks past it. A privacy screen filter only narrows the angle a fixed carrel still exposes; see what a filter actually blocks if you are weighing one for a seat you cannot turn.
What a silent floor adds on top of the geometry
A quiet reading floor changes two things a noisy space never asks of you. The first is sound. Headphones are the obvious fix everywhere else, worn the moment a reply might read aloud or a notification might chime, but a silent floor turns headphones into their own signal. Someone who notices a neighbour put headphones on abruptly, in a room where almost nobody is wearing any, registers the change itself before they ever wonder why.
The second is movement. In a cafe or an open office, people shift, stretch and reach for a bag constantly, so closing a lid or turning a screen away disappears into the general motion of the room. A silent floor has very little of that motion to hide inside. A sudden reach for the laptop lid the moment someone new sits down nearby stands out precisely because almost nothing else in the room is moving at that instant. The fix here is not a faster reaction, it is not needing one at all, which is the entire case for having the disguise already on before anyone sits down near you.
Working with fixed seating rather than against it
Choose the carrel or table end nearest a solid wall or shelving run
Since the seat cannot be turned later, get this part right at the start of the session rather than partway through it.
Skip a carrel that faces straight down the main aisle
A seat facing the busiest walkway between the shelves catches every pass for as long as you sit there, and there is usually no way to redirect it once you have unpacked.
Turn the disguise on before the laptop is even open
Toggle Shift and Escape, which both hides the disguise and brings it back while the lid is still down, so a fixed seat you cannot move away from never shows the real chat window to someone walking past behind you.
What the disguise does not solve here
A closer look still finds it, and a quiet room makes a closer look more likely
the address bar, which still reads claude.ai or chatgpt.com. A passer-by glancing past a fixed carrel reads a document shape as a document. Someone who stops, leans in, or checks the address bar directly can still work out what is actually open, and a silent floor gives a curious neighbour fewer distractions to compete with a longer look.
The seat covers one direction, the screen covers the rest
Pick the carrel or table end with a wall or shelving behind it rather than one facing the main aisle, and turn the disguise on before you sit, since neither the seat nor the screen alone covers an hours-long session on a quiet floor. The seat removes one direction of the steady foot traffic a reading room gets that a desk or a cafe table never does. The disguise covers what remains visible from whichever seats are actually free.
Use Docognito for the screen, and whichever carrel is left with something solid behind it for the rest of the session.