Issue details graph allows to filter displayed issues. There are four available filters:
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The content of the drop-down menus' of filters, reflects options available only in the displayed graph's issues:
The above images present situation where none of possible filters were selected. However, when one does so, then the displayed content's display should shrink. The below example present a situation where Link Type (1) was set to display only the "blocks" type of it, whilst Issue Type (2) was not yet altered: