As it's not possible to hide it, I've inquired with our rekordbox team as to why it's missing. Thanks for your patience.
Hi, since i updated to rekorbox 6, the sync manager has been missing.
i tried to switch the mode to export mode, but nothing changed.
i tried to uninstall and reinstall but still no SYNC manager, see the picture underneath.

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As it's not possible to hide it, I've inquired with our rekordbox team as to why it's missing. Thanks for your patience.
@Salmomé > Could you please email me the following file: C:\Users\usename\AppData\Roaming\Pioneer\rekordbox6\browseSetting.xml
Send it to forums@pioneerdj.com and put 4403585222809 in the subject line.
Thanks.
Hey Salome,
Could you please try deleting the browseSetting file and see if the button then becomes visible? Our engineers noted there is an issue with the file, deleting it would cause rekordbox to rebuild it.
Let us know if that works.
having same problem, the export manager button is just not where it should be, deleting browseSetting didnt help. running version 6.5.2. thx
Sorry to hear that, please file an inquiry ticket here and our support team will gather some additional information to assist you in resolving this issue.