Disable accent long press key

Disable accents.txt

https://apple.stackexchange.com/questions/332769/macos-disable-popup-showing-accented-characters-when-holding-down-a-key

# In macOS, when a key is held down while entering text, a popup is shown which lets one choose between various accented 
# forms of the character. To disable this execute the following command-line in the Terminal.app:

defaults write -g ApplePressAndHoldEnabled -bool false

# Now, you'll need to log-out and log back in. This should disable the display of the popup and character typed should 
# start repeating when the key is held down.

# If you ever wish to return to this behaviour, execute the following command-line in the Terminal.app:

defaults write -g ApplePressAndHoldEnabled -bool true

# You'll need to log-out and log back in again for the setting to take effect.