Thanks for reaching out. In addition to correct responses above, I'd request following this help article to know how to manage your workspace.
If you wish to reset preferences of Adobe Illustrator as suggested by Ali earlier, please follow this help article to do that.
**Please note that resetting preferences will remove all the custom settings and Illustrator will launch with default settings. You can also take a backup of the folders in case you want to. Location is mentioned in the article.