After upgrading from version 3.14 to 3.15

Hi,
Menu on left side do not shows up after updating to 3.15 from 3.14. Any advise how to fix it?

I had a similar issue with my installation. Upon checking my browser's console, I had warnings about the page trying to load from an insecure URL. Turns out, in my installation's ".env" file, the APP_URL points to "http://my-domain" instead of "https://my-domain". Try to see if this solves your issue as well.

Yes it fix the issue.
Thanks