Name Manager Not Opening

Hi,

I'm working on a worksheet and I'm trying to open up the name manager in the formulas tab, but it does not open when I click on it. The blue loading wheel pops-up for 1 second and then goes away, but nothing else happens. It seems that there are so many references in the worksheet that it crashes the name manager when I try to open it in this worksheet. I try to open it in a blank worksheet and it opens fine. Is there anyway to fix this issue? I am on an HP laptop using Windows 10. Thanks!