I think I found a work around for this. If you click on the "RTOS Proxy" or "ST-LINK" before opening a drop down or searching then open the register that you want the IDE will not hang. I believe this is because the IDE is trying to load all of the r...

Im having the same issue while trying to use the SFR view. Im developing on a U545 Nucleo board using an ST-LINK/V2 and everytime I try to type in the search bar or open a dropdown in SFR the entire IDE completely freezes.