Force Detach Screen From Another SSH Session

Option 1: Using -d -r

screen -d -r should do the trick. This is a combination of two commands.

screen -d detaches the already-running screen session, and screen -r reattaches the existing session. By running screen -d -r, you force screen to detach it and then resume the session.

Option 2: List displays

Short answer

1. Reattach without ejecting others: screen -x
2. Get list of displays: ^A *, select the one to disconnect, press D

Explained answer

PREFIX is usually ^A = Ctrl + A .

1. Reattach a session: screen -x.

   -x attach to a not detached screen session without detaching it.

2. List displays of this session: PREFIX *.

   It is the default key binding for: PREFIX :displays. Performing it within the screen, identify the other display we want to disconnect (e.g. smaller size). (Your current display is displayed in brighter color/bold when not selected).

   term-type   size         user interface           window       Perms
   ---------- ------- ---------- ----------------- ----------     -----
   screen     240x60         you@/dev/pts/2      nb  0(zsh)        rwx
   screen      78x40         you@/dev/pts/0      nb  0(zsh)        rwx

   Using arrows ↑ ↓ , select the targeted display, press D . If nothing happens, you tried to detach your own display and screen will not detach it. If it was another one, within a second or two, the entry will disappear.

3. Press Enter to quit the listing.