But for some reason the sidebar does not always appear. If I refresh the page, it's gone. If I refresh it again, it might be back. The only way to ensure that it returns always is by deleting the browser cache.
It sounds like it is an issue with how the JS or CSS is loading. What you referenced is from 2019 and there are most likely a number of changes to those in the application so there might be a conflict. When you inspect the page are you seeing any errors?
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