Online Editor cannot format target segments

When using the Online Editor I can change text in target segments. But I cannot change the formatting. No way possible. I use Google Chrome, Microsoft Edge with Chromium and also Firefox. None of these browsers can change the format of text in the target segement. 

I have adminitrator, project management, and linguistic review rights. My partners with only linguistic review rights also cannot change format. 

This is an absolutely necessary feature and very frustrating that it does not work.