If you are a JIRA administrator you can set up the Project Navigation to be enforced for all users on your instance or to let them chose however they like.
For that, point to your administrator panel, Project Navigation and change the default behaviour;
If you are not a JIRA administrator, however, then you can toggle this option using your Profile panel on JIRA.
Further information about it can be found here:
Thanks and I hope it helps!
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