Thanks for helping out. My question is how to remove the sidebar or hide it all the way. This is how it looks when the Reading and Bookmark panels are closed. You see the sidebar is still there showing what tabs are open in the browser. You see the page title and a close button but this is not something I need.
Below is how it looks when the Reading and Bookmark panels are opened. It is so crowded that I can't even see the bookmarks in this mode.The tab slides out a bit but not large enough for both Reading and Bookmarks to be visible. Not really a problem because I don't use Reading panel and I can edit the Bookmarks via the Bookmarks menu item on the application menu bar. I am just trying to show you that the sidebar I want to hide is not the Reading panel or the Bookmark panel but the one to the far left. It is still there when I collapse the Bookmarks and the Reader panels. I am on a smaller (13 inch) laptop and that makes it hard to use Safari for work. Thank you.
Clicking the book icon does not close the sidebar?
Try turning off Extensions, if any.
Safari > Preferences > Extensions
Try Safari again.
You can try deleting the Safari .plist file.
You will lose your Safari preference settings.
You will not lose the bookmarks.
Delete safari .plist file.
Quit all applications. Click on an empty spot on the desktop to activate Finder.
Hold the “Option” key down and click the "Go" menu in the Finder menu bar.
Select “Library” from the drop down.
Library > Preferences > com.apple.Safari.plist
Right click it and select "Move to Trash". Close Finder window.