I have a dashboard that doesn't want to open - its AGOL based (not enterprise) and I'm using some arcade to create a data expression in it as well as to create some advanced formatting. Is there a way to get to the components of the dashboard to see if disabling some aspect might resolve the issue?
You can take a look at the underlying JSON defining the dashboard. You could also use your brower's Developer Tools to watch the network traffic while the dashboard attempts to load, see if there are certain data sources causing it to freeze up.
Do you get an error? When you say it doesn't open, what does that look like?
What is the data expression?