@gpatel-fr The typo seems to have resulted from typing too quickly when I wrote this.
$ GDK_DPI_SCALE=2 snap run gimp
did solve half of the problem. All fonts are accordingly bigger and very good to read. Thank you for this!
However, all Buttons with their symbols on them (e.g. tool selection, layer selection,...) stay tiny.
Is there way to tweak this, too?
Maybe the terminal output is any help?
$ snap run gimp
(gimp:5667): Gdk-WARNING **: 17:13:55.133: Failed to read portal settings: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.portal.Desktop was not provided by any .service files
(gimp:5667): dbind-WARNING **: 17:13:55.167: AT-SPI: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files
set device 'Wayland Touch' to mode: disabled
set device 'Wayland Pointer' to mode: disabled
(gimp:5667): IBUS-WARNING **: 17:13:59.655: Failed to mkdir /home/phablet/snap/gimp/557/.config/ibus/bus: Not a directory
(gimp:5667): GLib-GIO-WARNING **: 17:13:59.662: Error creating IO channel for /proc/self/mountinfo: Permission denied (g-file-error-quark, 2)
(gimp:5667): Gdk-WARNING **: 17:14:00.405: Server is missing xdg_foreign support
gimp_widget_set_handle_on_mapped: gdk_wayland_window_export_handle() failed. It will not be possible to set windows in other processes as transient to this display shell.
(gimp:5667): Gdk-WARNING **: 17:14:00.406: Server is missing xdg_foreign support
gimp_widget_set_handle_on_mapped: gdk_wayland_window_export_handle() failed. It will not be possible to set windows in other processes as transient to this display shell.
(gimp:5667): Gdk-CRITICAL **: 17:14:06.972: gdk_wayland_window_unexport_handle: assertion 'impl->display_server.xdg_exported_v2 || impl->display_server.xdg_exported_v1' failed