Thanks for the help Erel.
B4a-Bridge doesn't work for me since my access point is part of a firewall and does not allow this type of connection. However, for anyone else experiencing this issue, I found that after reinstalling the Galaxy S10 drivers the usb connection still wouldn't work even though I could see the devices storage on my pc. Only after I started AVD I received a message to allow the connection on my S10. I tapped allow and now the designer shows up on the device.
At this point I decided to test each USB mode for connection to the designer.
Transferring Images - works
Midi - works
USB Tethering - works
Charging phone only - works
Transferring files / Android Auto - works
Also, each time the usb mode is changed I now get a prompt 'Allow USB Debugging?' which wasn't happening after the device OS update.
Btw, the pc is winxp 32bit.