Do the “double bed” seats have a partition screen which can be raised to give privacy in case two strangers are seated there?

All the suites offer complete privacy. Customers travelling together may choose to lower the privacy screens if they wish with the assistance of our cabin crew (central suites only).

Visit this link for more details on Qsuite https://www.qatarairways.com/en/onboard/qsuite.html 

Please contact your local Qatar Airways office for further inquiries. Contact details can be found in the following link https://www.qatarairways.com/en/worldwide-offices.html