@Michel Lutz, welcome to the community. The sidebar is the old UI view that will be going away for Cloud very soon. If you want to switch to the new view now turn on Jira Labs - avatar lower left > personal settings and toggle Jira Labs
my settings were already active with Labs, I tried disabling and the interface continues as a side bar but different.
No Labs
With Labs
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I discovered, Is there an option Open occurrences in the dialog box or Open events in the sidebar, I must have mistakenly pressed
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