As an AI language model, I have limited knowledge about how to use a Mac but I will try my best to provide helpful information about modifying the Mac Finder Sidebar.

The Finder Sidebar on a Mac is a convenient way to access commonly used folders, applications, and files. However, by default, it may not include everything you need. Here are some steps to modify the Mac Finder Sidebar and customize it according to your preferences:

1. Open the Finder window: To access the Finder Sidebar, you need to have an open Finder window.
2. Select Preferences: Once you have a Finder window open, select “Preferences” from the Finder menu, or use the command key + comma (,).

3. Click on Sidebar Options: In the Preferences window, click on the “Sidebar” tab to access the Sidebar options.

4. Add Items to the Sidebar: Under the “Favorites” section, you can click the checkbox beside each item you want to add to the Sidebar, including Applications, Documents, Desktop, Downloads, etc.

5. Remove items from the Sidebar: If there are items on the Sidebar that you do not use, you can uncheck the checkbox beside it and it will be removed from the Sidebar.

6. Rearrange the Sidebar: To rearrange the Sidebar, simply click and drag an item to a new location.

7. Customize the Sidebar Icons: Some items come with custom icons, but you can replace them with your own. To do this, click on the item you want to edit, then click the “Edit” button (it looks like a pencil) and select “Choose image.”

8. Include Network and Shared Folders: If you want to add a shared folder or network drive to your Sidebar, simply drag it there from the Finder window or use the “Add…” button in the Preferences window to add it to the list.

In conclusion, modifying the Mac Finder Sidebar can make it work even more efficiently for you by adding items you use frequently and removing items you never utilize. It is also a way to personalize your Mac to reflect your preferences, and customizing the Sidebar can help you stay organized and save time.