I can view all features except Release pipelines which is showing empty screen for me as shown below. I have tried different browsers such as Google Chrome and Microsoft Edge, both showing empty screen. I have verified that I have full access permissions and Visual Studio subscription also. Let me know if you ever faced such issue and a solution for this. Thanks.

Been hating Azure Portal because they never cared about how intuitive their UI, menus, and options are. It's very hard to navigate. I just want to rant. Here's how you can enable the Release option:
Go to organization settings

Turn off Disable classic release

No idea why they disabled it by default. It says classic and not deprecated, so it should be visible.
Edit (11/03/23): I've read somewhere that Release will be deprecated in favor of a multi-staged pipeline. That explains. They could have added some notes though.
You could troubleshoot this issue by checking following steps.
BTW, we find that there are service events, which might causes this issue, you could monitor it.
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