There's a few other suggestions that address specific areas, but this suggestion should apply for all entities in Octane.
Only certain fields are available to be used in the display of, and usage of fields within Octane.
Ideally we would expect to be able to choose ALL columns available to a specific entity (Epic, Feature, User Story, Task, Defect etc...), and also be able to be able to use these fields to sort, group by, or filter on.
Currently, only certain fields (different on each area of the application), are available.
"DASHBOARD - Improve additional filters"
"Filter over the "failed" UFT tests runs"
"Add Capability to Filter/Sort Additional Fields for Test Suites and Test Suite Runs"