Apologies for the delayed response. This is not the usual behavior of the app. Please try resetting the preferences of the app & see if it helps. You may follow the instructions below to do that:
Close all Adobe applications.
Go to locations
Rename Adobe Illustrator, com.adobe.illustrator and Adobe Illustrator 24 Settings folders to Adobe Illustrator.old, com.adobe.illustrator.old and Adobe Illustrator 24 Settings.old
Launch Illustrator from the Creative Cloud.
**Please note that resetting preferences will remove all the custom settings and Illustrator will launch with default settings. This way all your old settings will be saved in .old folders and Illustrator will recreate new folders with default settings.