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In gnome-terminal Ubuntu Unity 16.04 LTS the menu works for all three zoom features within the View menu:

• Zoom In


• Zoom Out


• Normal Size

Only two shortcut keys work:

• 
  Ctrl+Shift++ works to Zoom In
  


• 
  Ctrl+- works to Zoom Out.

Attempting to restore Normal Size I found Ctrl+o or Ctrl+Shift+O do not work. These key combinations perform as if the Enter was used.

My modified setup

$ cat .inputrc



# ~/.inputrc - complements /etc/inputrc - global inputrc for libreadline

# April 15, 2019

# See readline(3readline) and `info rluserman' for more information.



$include /etc/inputrc



# Insert key to togged overwrite-mode

"e[2~": overwrite-mode



# April 22, 2019 AU Q&A: https://askubuntu.com/q/1135306/307523

# Make Shift-tab act like "cd ../" (move to parent directory)

"e[Z": "cd ../"

Custom keyboard shortcuts

• I believe these are standard. At least I don't remember changing them.


• I reviewed all the other shortcuts and Ctrl+o doesn't appear.

Ubuntu skeleton setup

$ cat /etc/inputrc



# /etc/inputrc - global inputrc for libreadline

# See readline(3readline) and `info rluserman' for more information.



# Be 8 bit clean.

set input-meta on

set output-meta on



# To allow the use of 8bit-characters like the german umlauts, uncomment

# the line below. However this makes the meta key not work as a meta key,

# which is annoying to those which don't need to type in 8-bit characters.



# set convert-meta off



# try to enable the application keypad when it is called.  Some systems

# need this to enable the arrow keys.

# set enable-keypad on



# see /usr/share/doc/bash/inputrc.arrows for other codes of arrow keys



# do not bell on tab-completion

# set bell-style none

# set bell-style visible



# some defaults / modifications for the emacs mode

$if mode=emacs



# allow the use of the Home/End keys

"e[1~": beginning-of-line

"e[4~": end-of-line



# allow the use of the Delete/Insert keys

"e[3~": delete-char

"e[2~": quoted-insert



# mappings for "page up" and "page down" to step to the beginning/end

# of the history

# "e[5~": beginning-of-history

# "e[6~": end-of-history



# alternate mappings for "page up" and "page down" to search the history

# "e[5~": history-search-backward

# "e[6~": history-search-forward



# mappings for Ctrl-left-arrow and Ctrl-right-arrow for word moving

"e[1;5C": forward-word

"e[1;5D": backward-word

"e[5C": forward-word

"e[5D": backward-word

"ee[C": forward-word

"ee[D": backward-word



$if term=rxvt

"e[7~": beginning-of-line

"e[8~": end-of-line

"eOc": forward-word

"eOd": backward-word

$endif



# for non RH/Debian xterm, can't hurt for RH/Debian xterm

# "eOH": beginning-of-line

# "eOF": end-of-line



# for freebsd console

# "e[H": beginning-of-line

# "e[F": end-of-line



$endif

Any clues?

The default shortcut for restoring the zoom in gnome-terminal, as in many other apps, is Ctrl + 0 (zero)

You can alter it in gnome-terminal's preferences, that is, neither in inputrc nor among the global desktop-wide shortcuts.