Eclipse: get a rid of this "mark occurrences" bar? - eclipse

As you may see from the screenshot below it seems I'm having a problem with an eclipse button bar (v4.6 Neon / Linux AMD64). I see a toolbar with a lot of "Mark Occurences" buttons, there're a lot of them (9) and I don't know how to turn this bar off (disable, customize or hide it). Is there a way to do that ?
Thanks in advance for your kind reply
Ben

Replying to myself to solve my own problem but BTW it could probably solve it for someone else as well.
I have had this problem since Eclipse Mars.2 and it seems to be something related to the workspace. Here's what I did:
Applied tobias_k suggestion
quit from eclipse Neon
opened the same workspace with eclipse Mars.2, replyed OK to the eclipse warning message related to version mismatch
quit again from Mars.2 and reopened with Neon again, same warning message, pressed OK again
After these operations I don't have that toolbar, it seems there's something related to the workspace and after an upgrade it was automatically cleaned

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