@rani Sorry for not having been clear enough about the presets.
Actually, there are two different flows: one internal and the other external.
The menu Save Preset As… and Manage Presets work together. Presets are saved internally.
To use the Import Preset, the preset needs to be saved externally to the disk through the Export button on the Presets pane.
My fault: I didn’t noticed the Export button as it was light grey on dark grey.
It would be nice to make the flows management more explicit and consistent,
- either by removing the Import Preset from the File menu and moving it to the Manage Preset pane,
- or by adding an Export Preset option to the File menu.