1) Manage Options
2) (Body font sized link) Manage
3) (Body font sized link) Show
4) Scroll down
5-100) Click each toggle individually (select all button is currently broke) (It is intentionally ambiguous which is the 'correct' selection)
101-150) Do the same on other page
151) Click done
152) Click OK (hoping it's saved, it doesn't feel like it has)
This is much harder than it is to opt-in. I'm pretty sure this against the spirit of the GDPR.
Even if it isn't against the GDPR. It's a dick move.