This issue is similar to one previously reported with version 2.8 but is reappearing in 3.2.0 after recent Windows update. When working with layer symbology, Pro crashes. Installed updated .NET (4.8) and it seems to have corrected itself.
According to
ArcGIS Pro 3.2 system requirements—ArcGIS Pro | Documentation
Software Minimum requirement
Microsoft .NET
Microsoft .NET Desktop Runtime 6.0.5 or a later patch release (6.0.6 and so on), using a Windows x64 installer, is required. The presence of Microsoft .NET Desktop Runtime 7 or later is inconsequentia
In addition to what Dan's mentioned above, whenever I see general wonkiness like this, I rename the ESRI folders in my C:\users\user_profile\appdata\local and :\users\user_profile\appdata\roaming to ESRI_OLD. This is a soft reset of the ArcGIS Pro application and tends to fix many "strange" errors and crashes.