In a project with multiple languages, all target languages are selected by default when creating a new job.
When working with bilingual XLIFF files, which are target-specific, it is necessary to manually deselect all other target languages.
Some competitive tools do allow this option.
Available workaround (if any):
Manual deselection of all other target languages
Separate projects for each target language
Quick tip: Holding Shift key and clicking on the language selects/deselects all other languages.
Checkbox to select/unselect all target languages when creating a job - see this screenshot
Possibility to import files by target language - see this example
Working with multiple bilingual XLIFF files, which are target language specific
Translating a set of files into multiple target languages, where not all files are translated for into all target languages