Question
How to reset Illustrator Preferences
| Backup and Reset Illustrator Preferences on Windows | Backup and Reset Illustrator Preferences on macOS |
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To restore preferences quickly using a keyboard shortcut
Press and hold Alt+Control+Shift (Windows) or Option+Command+Shift (macOS) as you start Illustrator. The new preferences files are created the next time you start Illustrator.
To manually restore preferences to default
Remove or rename the Adobe Illustrator Preferences file. When you restart Illustrator, a new preference file will be created in the original location.
Folder location:
macOS: <OSDisk>/Users/<username>/Library/Preferences/Adobe Illustrator <version number> Settings/en_US*/Adobe Illustrator Prefs

A simple way to access user library in Mac.
Windows: <OSDisk>\Users\<username>\AppData\Roaming\Adobe\Adobe Illustrator <version number> Settings\en_US*\x64\Adobe Illustrator Prefs
*If you need to keep a backup of the old Preferences, copy the folder to the desktop or simply rename it.
