In order for your freelance translator to see the translations of others, you will need to go to Settings > Access Rights in Wordbee Translator.
Then go to the User Profile they have been assigned and click on Select to make changes.
Please note that by changing these settings for a pre-defined user profile, it will also change these settings for every user assigned to that profile. If you do not want to do this, you will need to create a custom profile from the appropriate pre-defined one and then enable the following settings. For more information see here: Creating Custom Profiles.
Then enable the following access rights depending on your needs and save the profile.
Number 32 - Can view translations in all languages beyond job languages (enabled by default on pre-defined External Worker Profile).
Number 33 - Can edit translations in all languages beyond job languages (disabled by default on pre-defined External Worker Profile)