Streaming live at 10am (PST)

Editor Dashboard: Hide "Collections" and "Listings Tables" Menu in Toolbar - Pages and Forms only

Hi all
Is it possible to hide the menus “Collections” and “Listing Tables” in EDITOR Toolbar as our client only needs “Pages” and “Forms” for Editing. Same with the button “Settings” in every row with CSS class display:none ?

Other question: Where can I edit Custom CSS for the EDITOR to add display:none CSS ?

Any ideas?