What is the quickest way to see all tasks assigned to a user?

You’re welcome to use board filters or the global search, accessible from any Kanban board. Filtering looks through the open board only, while searching looks through all the boards that you have access to.

Just type in @ + user initials (i.e. @XY) in either of the two to see the results. Searching and filtering by @XY finds task and checklist items assigned to the searched user.

Learn more about Kanban Tool filters here.