I have a large document (526 MB) that takes a few minutes to load. So I'm trying to break it up into smaller documents. I saved out a new one (504 MB) and this new doc won't load. After 15 minutes Designer is unresponsive. This is on Catalina 10.15.7 on a 2019 Macbook Pro.
I tried to attach the file to this post, but the upload failed. If there's a secure place to upload the files I'd be happy to upload them.
Update: I reproduced this crash with a smaller document, and then discovered that closing down and reopening Designer gets around it.