Recently, the old view of Jira issues was removed permanently.
You can still switch back to old view on a per-issue basis.
For many many people it is a dramatic downgrade with their User-Experience and productivity.
It will be really great, if someone can find a simple way to turn this feature back.
But they have to want to be turned. ;-)
I don't think there's any chance of a u-turn on this one.
It took almost 5 years of everyone telling them the "menus on the left side" was a completely failed design on Cloud before they grudgingly moved it back to the right place at the top.
The old view is dead, I don't think even a decade of complaining will get it back.