It is moved to the "playground" section 
Run Gimp with the --show-playground switch to show it in Edit -> Preferences and enable the option.
Ubuntu 20.10 and Gimp 2.10.24 ? Is this a flatpak or a snap ? I have no idea how you might run Gimp with that switch, however a little dabbling and a search of my Gimp user profile finds the setting in the gimprc file. Easy enough to add it to the top.
Run Gimp with the --show-playground switch to show it in Edit -> Preferences and enable the option.Code:
gimp --show-playgroundUbuntu 20.10 and Gimp 2.10.24 ? Is this a flatpak or a snap ? I have no idea how you might run Gimp with that switch, however a little dabbling and a search of my Gimp user profile finds the setting in the gimprc file. Easy enough to add it to the top.
Code:
# GIMP gimprc
#
# This is your personal gimprc file. Any variable defined in this file takes
# precedence over the value defined in the system-wide gimprc:
# /media/rich/Data/gimp-app-2-10-22/squashfs-root/usr/etc/gimp/2.0/gimprc
# Most values can be set within GIMP by changing some options in the
# Preferences dialog.
(use-opencl yes)
(interpolation-type nohalo)