Hello Laura,
What’s happening here is that the Group Policy console is struggling to display such a large and complex baseline in its built‑in viewer, so it freezes and crashes. The easiest way around this is to skip the console and use PowerShell instead. Running Get-GPOReport -Name "<your GPO name>" -ReportType HTML -Path C:\Temp\Baseline.html will generate the same settings report quickly without crashing. If the baseline is extremely heavy, consider splitting it into smaller GPOs, but in most cases the PowerShell report solves the issue.
Harry.