How to hide Toolbar, Action and other buttons

Hi guys and girls,

I was wondering how to hide the buttons appearing on the front end upload zone. I have searched the FAQs and the posts from the past but couldn't find any solution. 

If you take a look at the picture attached, you can see that it is overcrowded by buttons. I would like to have only some buttons in order not to make it complicated for the buyers.

Thank you in advance!