I agree that there is no ideal way of seeing all flows and it's not the most user friendly way - but there is actually two ways :)
1. Look in the default solution and filter on flows. All yours flow should be visible there no matter what solution they are in.
2. Do an advanced find on the entity processes and category modern flow. Downside with this is that you can not open them from here, it's just to see the list of flows - not for looking at the steps in the flow.
If you've found this thread useful, dive deeper into User Group community content by role