Arranging the window for two people
Four steps that put the game frame where both people can see it, without anyone stretching their neck.
One screen, two people looking at it, and one game frame sitting somewhere between two heads. Where you put that frame decides who spends the round with a twisted neck and who says first that they cannot see properly. Fortunately it takes four actions, and all four fit inside half a minute. None of them need an extension, an account or a trip to the settings menu, and all four can be undone in the same half minute.
The first is full screen. F11 does it on Windows, Ctrl Command F on a Mac. Full screen removes the address bar, the tab strip and the taskbar, which returns a surprising amount of height above and below the frame. On a small monitor that space is exactly where the characters feet live, and losing it means losing the part of the screen you look at most. The address bar is the single largest thing removed by that key.
The second is hiding the bookmarks bar. Ctrl Shift B toggles it, and if you use a side panel its close button sits at the top right of the panel. Every bar like that costs a few dozen pixels of width, and width is what two players need most, because they sit side by side rather than on top of each other. A side panel costs even more width than a toolbar, and it is usually open by accident.
The third is returning zoom to exactly one hundred percent. Ctrl 0 does that in most browsers. Zooming in crops the bottom of the game frame, which is usually where the start button and the key instructions live. Zooming out makes the on-screen text too small for the person sitting further away, and they will ask you to repeat things all evening. Zoom also changes how the mouse cursor maps onto the frame, which matters in games that read clicks.
The fourth is dealing with the taskbar, either by auto-hiding it or by moving it out of the way. On Windows, right-click the taskbar, open its settings, and switch on auto-hide. The bar sits at the bottom of the screen and covers exactly the strip characters walk through. Hiding it makes the round noticeably cleaner, and nobody has to guess whether something is standing on their feet. On a Mac, the same bar lives at the top of the screen and can be hidden from the system settings.
Do not open two windows side by side so each person can have one. It sounds sensible and usually backfires: the browser only sends keys to the window that holds focus, so the person in the other window presses keys and nothing happens. Real two-player games draw both characters inside one frame, which is precisely why you do not need to split windows at all. One window, one frame, one keyboard: that is the arrangement every game here is built around.
Place the frame so the middle of the screen lines up with the middle of the two chairs. If the monitor sits off to one side, the person further away views it at an angle and sees the picture skewed, especially in games with a lot of horizontal movement. Move the monitor or move the chairs, but do not leave anybody watching from roughly forty-five degrees for a whole evening.
The distance from eyes to screen is worth setting once as well. Sitting close is clear but glares; sitting far forces squinting and loses small details. A simple method: both people stretch an arm out, and if the fingertips just touch the edge of the monitor, that distance works for both, and it also forces the two of you to sit level instead of at an angle. Feet flat on the floor matter as much as the height of the monitor.
When the arrangement is done, play one short round and watch whether anybody keeps tilting their head or shifting position. If they do, adjust one of the four things above. Setting up takes half a minute, but it decides whether the evening happens in a comfortable posture or in one long stretch of the neck. Two minutes of arranging beats an hour of both people leaning sideways, and it is the cheapest improvement available in the room.