How to open Genetic Apex booster packs after Space-Time Smackdown release?

With the release of Space-Time Smackdown, the front page of Pokémon TCG Pocket shows up the Mew Pack from Mythical Island, the Dialga Pack from Space-Time Smackdown and the Palkia Pack from Space-Time Smackdown. The previous packs from Genetic Apex don't appear there, but you can still open them:

1. Click on any booster pack on the front page
2. Click on "Select other booster packs"
3. Select the Expansion you want to open from
4. Pick the booster pack you want to open from this expansion

Here's a video tutorial: