The first Seelie is floating on a stone pillar that you will have to split to direct the Seelie.
The second one is on the right side of the first Seelie, you will have to place it on another pillar.
You will find another one on the left side of the cylindrical wind barrier > enter the current to use the Anemo skill on the pillar and destroy the wind barrier. When the barrier is gone, direct the Seelie to its pillar.
And the last one is behind the rock formation on the right side of the Cecilia Garden domain. After you direct all the Seelie to their pillars, the seal of the Cecilia Garden domain will be broken to unlock.
After introducing you this guide on how to unlock Cecilia Garden in Genshin Impact, we hope you can unlock this garden and can farm ascension materials.