The selected configurations of the report -
Selected report type - Issue Type View, Link Type View, Tree View
Selected filter
Issue Card fields
Table fields (in case of Tabular Reports)
Selected Filters on Jira Attributes - Priority, Link Type and Issue Type ( in case of Tree Reports)
Show/Hide Orphan Issues (in Case of Tree Reports)
are stored in the local storage of the browser, so that the user can skip selecting their configuration each time from scratch.
So when the user chooses a particular configuration, and comes back next time, the last chosen configuration is selected by default and the report is shown accordingly.