The following was created for use with Stylus. You can download it for Firefox or Chrome-based browsers.

UserCSS

• Google Maps Bar None [ Homepage | Download ] Removes the lefthand bar from desktop Google Maps.

How to install UserCSS files:

• Best case scenario: Open the link. Click install.
• Worst case scenario: Copy everything in the .user.css file. Open Stylus Write a new style as UserCSS (check the box). Select everything in the box, then delete it. Paste content into text area. It should auto-fill.
• Save and enable after either scenario.