How to fix Voyager Laravel Admin auto logout when use Admin site & other Laravel site in same browser

I'm developing two Laravel projects: one is a customer site ( normal Laravel Project ) & the other is admin site using Voyager.
But when I open two sites on same browser, Voyager admin is logged out when I browse customer site.
How to run Voyager admin & Laravel project on one browser normally ?
Thank you

via Chebli Mohamed