We have a template that we go through to ensure that anything can be tracked and also so we don't forget to cover anything. We don't have to cover everything in each 1:1 meeting, it is a guideline.
Importantly, I can also reach out to my manager directly for ad hoc things at any time.
We don't talk about the same things that are discussed in standup.
We do talk about my overall current and upcoming workload, any issues with my KPIs and how manager can help, any new company policies, my training goals, manager's training goals, what my plans are to take annual leave, as well as a generic "anything to discuss" section.
Then if time allows, we also chat about other things besides work.
The meeting is scheduled so isn't interrupting anything, and can be shifted around the calendar if there is high priority work happening. However we try hard to reschedule rather than skip it.