The Enable Mouse Cursor Style option allows you to change the cursor for all the theme.
1. Log into your Blogger dashboard.
2. Go to Theme > Customize > Advanced > Animations & effects.
3. Make necessary changes > Save.
Mouse Cursor Style:
To disable: Value 0px to disable.
Cursor Style Dot: Value 1px to enable.
Cursor Style Circle: Value 2px to enable.
Cursor Style Plus: Value 3px to enable.