In v.2022 a mask of the sky can be automatically created by the program, but without going into the new Sky module. I thought I would mention this in case anybody else has missed this. I nearly did because the option is a little hidden away.
After opening the usual masking tools, on the menu bar go to Mask --> Mask Sky. That's it.
The created mask is not always perfect, but can be adjusted using the refine tools. This method may be faster and easier than creating a sky mask "manually".
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