The Post sidebar tab allows you to show or hide sidebar, by default on the right and position the sidebar on the left. You may also hide/show the right sidebar.
1. Log into your Blogger dashboard.
2. Go to Theme > Customize > Advanced > Post sidebar.
3. Make necessary changes > Save.
Enable post Sidebar:
To disable: Value 0px to disable.
To enable: Value 1px to enable.
Post Left sidebar:
Position rigth: Value 0px to enable.
Position left: Value 1px to enable.
Enable post details sidebar:
To disable: Value 0px to disable.
To enable: Value 1px to enable.