Clear old data using GUI

I’ve been developing the tracking logic and by doing that have created lot’s of irrelevant data. Is there a way to clear all old data?

I’m using the hosted Matomo so I can’t access the database (nor do I really want to).

There is Admin > Privacy > GDPR Tools, but is that really the simplest solution?

Using Admin > Privacy > GDPR Tools
Then configuring:
Days since first visit + At least + 0
This seems to select all data, making it pretty easy to remove all old data.