To hide the bookmarks bar in Google Chrome:
Press CMD + SHIFT + B on Mac
Press CTRL + SHIFT + B on Windows
This shortcut toggles the bookmarks bar on or off.
I don’t like including my Chrome bookmarks in browser screenshots; they are irrelevant to my work and sometimes personal. This hotkey toggles hiding or showing the Chrome browser bookmarks bar. My workflow is toggle off the bookmarks, take a clean browser screenshot, and then toggle them back on.